diff --git a/package-lock.json b/package-lock.json
index 090d1a1..8686f40 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4,6 +4,72 @@
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
+    "assertion-error": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/assertion-error/-/assertion-error-1.1.0.tgz",
+      "integrity": "sha512-jgsaNduz+ndvGyFt3uSuWqvy4lCnIJiovtouQN5JZHOKCS2QuhEdbcQHFhVksz2N2U9hXJo8odG7ETyWlEeuDw==",
+      "dev": true
+    },
+    "chai": {
+      "version": "4.5.0",
+      "resolved": "https://registry.npmjs.org/chai/-/chai-4.5.0.tgz",
+      "integrity": "sha512-RITGBfijLkBddZvnn8jdqoTypxvqbOLYQkGGxXzeFjVHvudaPw0HNFD9x928/eUwYWd2dPCugVqspGALTZZQKw==",
+      "dev": true,
+      "requires": {
+        "assertion-error": "^1.1.0",
+        "check-error": "^1.0.3",
+        "deep-eql": "^4.1.3",
+        "get-func-name": "^2.0.2",
+        "loupe": "^2.3.6",
+        "pathval": "^1.1.1",
+        "type-detect": "^4.1.0"
+      }
+    },
+    "check-error": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/check-error/-/check-error-1.0.3.tgz",
+      "integrity": "sha512-iKEoDYaRmd1mxM90a2OEfWhjsjPpYPuQ+lMYsoxB126+t8fw7ySEO48nmDg5COTjxDI65/Y2OWpeEHk3ZOe8zg==",
+      "dev": true,
+      "requires": {
+        "get-func-name": "^2.0.2"
+      }
+    },
+    "deep-eql": {
+      "version": "4.1.4",
+      "resolved": "https://registry.npmjs.org/deep-eql/-/deep-eql-4.1.4.tgz",
+      "integrity": "sha512-SUwdGfqdKOwxCPeVYjwSyRpJ7Z+fhpwIAtmCUdZIWZ/YP5R9WAsyuSgpLVDi9bjWoN2LXHNss/dk3urXtdQxGg==",
+      "dev": true,
+      "requires": {
+        "type-detect": "^4.0.0"
+      }
+    },
+    "get-func-name": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/get-func-name/-/get-func-name-2.0.2.tgz",
+      "integrity": "sha512-8vXOvuE167CtIc3OyItco7N/dpRtBbYOsPsXCz7X/PMnlGjYjSGuZJgM1Y7mmew7BKf9BqvLX2tnOVy1BBUsxQ==",
+      "dev": true
+    },
+    "loupe": {
+      "version": "2.3.7",
+      "resolved": "https://registry.npmjs.org/loupe/-/loupe-2.3.7.tgz",
+      "integrity": "sha512-zSMINGVYkdpYSOBmLi0D1Uo7JU9nVdQKrHxC8eYlV+9YKK9WePqAlL7lSlorG/U2Fw1w0hTBmaa/jrQ3UbPHtA==",
+      "dev": true,
+      "requires": {
+        "get-func-name": "^2.0.1"
+      }
+    },
+    "pathval": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/pathval/-/pathval-1.1.1.tgz",
+      "integrity": "sha512-Dp6zGqpTdETdR63lehJYPeIOqpiNBNtc7BpWSLrOje7UaIsE5aY92r/AunQA7rsXvet3lrJ3JnZX29UPTKXyKQ==",
+      "dev": true
+    },
+    "type-detect": {
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/type-detect/-/type-detect-4.1.0.tgz",
+      "integrity": "sha512-Acylog8/luQ8L7il+geoSxhEkazvkslg7PSNKOX59mbB9cOveP5aq9h74Y7YU8yDpJwetzQQrfIwtf4Wp4LKcw==",
+      "dev": true
+    },
     "yard": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/yard/-/yard-1.0.3.tgz",
diff --git a/yarn.lock b/yarn.lock
index 4dbd8f9..5e12108 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -13,9 +13,10 @@ array-flatten@1.1.1:
   version "1.1.1"
   resolved "https://registry.yarnpkg.com/array-flatten/-/array-flatten-1.1.1.tgz#9a5f699051b1e7073328f2a008968b64ea2955d2"
 
-assertion-error@^1.0.1:
-  version "1.0.2"
-  resolved "https://registry.yarnpkg.com/assertion-error/-/assertion-error-1.0.2.tgz#13ca515d86206da0bac66e834dd397d87581094c"
+assertion-error@^1.1.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/assertion-error/-/assertion-error-1.1.0.tgz#e60b6b0e8f301bd97e5375215bda406c85118c0b"
+  integrity sha512-jgsaNduz+ndvGyFt3uSuWqvy4lCnIJiovtouQN5JZHOKCS2QuhEdbcQHFhVksz2N2U9hXJo8odG7ETyWlEeuDw==
 
 balanced-match@^1.0.0:
   version "1.0.0"
@@ -51,20 +52,25 @@ bytes@3.0.0:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/bytes/-/bytes-3.0.0.tgz#d32815404d689699f85a4ea4fa8755dd13a96048"
 
-chai@^4.1.2:
-  version "4.1.2"
-  resolved "https://registry.yarnpkg.com/chai/-/chai-4.1.2.tgz#0f64584ba642f0f2ace2806279f4f06ca23ad73c"
+chai@^4.5.0:
+  version "4.5.0"
+  resolved "https://registry.yarnpkg.com/chai/-/chai-4.5.0.tgz#707e49923afdd9b13a8b0b47d33d732d13812fd8"
+  integrity sha512-RITGBfijLkBddZvnn8jdqoTypxvqbOLYQkGGxXzeFjVHvudaPw0HNFD9x928/eUwYWd2dPCugVqspGALTZZQKw==
   dependencies:
-    assertion-error "^1.0.1"
-    check-error "^1.0.1"
-    deep-eql "^3.0.0"
-    get-func-name "^2.0.0"
-    pathval "^1.0.0"
-    type-detect "^4.0.0"
-
-check-error@^1.0.1:
-  version "1.0.2"
-  resolved "https://registry.yarnpkg.com/check-error/-/check-error-1.0.2.tgz#574d312edd88bb5dd8912e9286dd6c0aed4aac82"
+    assertion-error "^1.1.0"
+    check-error "^1.0.3"
+    deep-eql "^4.1.3"
+    get-func-name "^2.0.2"
+    loupe "^2.3.6"
+    pathval "^1.1.1"
+    type-detect "^4.1.0"
+
+check-error@^1.0.3:
+  version "1.0.3"
+  resolved "https://registry.yarnpkg.com/check-error/-/check-error-1.0.3.tgz#a6502e4312a7ee969f646e83bb3ddd56281bd694"
+  integrity sha512-iKEoDYaRmd1mxM90a2OEfWhjsjPpYPuQ+lMYsoxB126+t8fw7ySEO48nmDg5COTjxDI65/Y2OWpeEHk3ZOe8zg==
+  dependencies:
+    get-func-name "^2.0.2"
 
 commander@2.11.0:
   version "2.11.0"
@@ -102,9 +108,10 @@ debug@3.1.0:
   dependencies:
     ms "2.0.0"
 
-deep-eql@^3.0.0:
-  version "3.0.1"
-  resolved "https://registry.yarnpkg.com/deep-eql/-/deep-eql-3.0.1.tgz#dfc9404400ad1c8fe023e7da1df1c147c4b444df"
+deep-eql@^4.1.3:
+  version "4.1.4"
+  resolved "https://registry.yarnpkg.com/deep-eql/-/deep-eql-4.1.4.tgz#d0d3912865911bb8fac5afb4e3acfa6a28dc72b7"
+  integrity sha512-SUwdGfqdKOwxCPeVYjwSyRpJ7Z+fhpwIAtmCUdZIWZ/YP5R9WAsyuSgpLVDi9bjWoN2LXHNss/dk3urXtdQxGg==
   dependencies:
     type-detect "^4.0.0"
 
@@ -209,9 +216,10 @@ fs.realpath@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/fs.realpath/-/fs.realpath-1.0.0.tgz#1504ad2523158caa40db4a2787cb01411994ea4f"
 
-get-func-name@^2.0.0:
-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/get-func-name/-/get-func-name-2.0.0.tgz#ead774abee72e20409433a066366023dd6887a41"
+get-func-name@^2.0.1, get-func-name@^2.0.2:
+  version "2.0.2"
+  resolved "https://registry.yarnpkg.com/get-func-name/-/get-func-name-2.0.2.tgz#0d7cf20cd13fda808669ffa88f4ffc7a3943fc41"
+  integrity sha512-8vXOvuE167CtIc3OyItco7N/dpRtBbYOsPsXCz7X/PMnlGjYjSGuZJgM1Y7mmew7BKf9BqvLX2tnOVy1BBUsxQ==
 
 glob@7.1.2:
   version "7.1.2"
@@ -284,6 +292,13 @@ lolex@^2.1.3:
   version "2.1.3"
   resolved "https://registry.yarnpkg.com/lolex/-/lolex-2.1.3.tgz#53f893bbe88c80378156240e127126b905c83087"
 
+loupe@^2.3.6:
+  version "2.3.7"
+  resolved "https://registry.yarnpkg.com/loupe/-/loupe-2.3.7.tgz#6e69b7d4db7d3ab436328013d37d1c8c3540c697"
+  integrity sha512-zSMINGVYkdpYSOBmLi0D1Uo7JU9nVdQKrHxC8eYlV+9YKK9WePqAlL7lSlorG/U2Fw1w0hTBmaa/jrQ3UbPHtA==
+  dependencies:
+    get-func-name "^2.0.1"
+
 media-typer@0.3.0:
   version "0.3.0"
   resolved "https://registry.yarnpkg.com/media-typer/-/media-typer-0.3.0.tgz#8710d7af0aa626f8fffa1ce00168545263255748"
@@ -393,9 +408,10 @@ path-to-regexp@^1.7.0:
   dependencies:
     isarray "0.0.1"
 
-pathval@^1.0.0:
-  version "1.1.0"
-  resolved "https://registry.yarnpkg.com/pathval/-/pathval-1.1.0.tgz#b942e6d4bde653005ef6b71361def8727d0645e0"
+pathval@^1.1.1:
+  version "1.1.1"
+  resolved "https://registry.yarnpkg.com/pathval/-/pathval-1.1.1.tgz#8534e77a77ce7ac5a2512ea21e0fdb8fcf6c3d8d"
+  integrity sha512-Dp6zGqpTdETdR63lehJYPeIOqpiNBNtc7BpWSLrOje7UaIsE5aY92r/AunQA7rsXvet3lrJ3JnZX29UPTKXyKQ==
 
 proxy-addr@~2.0.2:
   version "2.0.2"
@@ -493,9 +509,10 @@ text-encoding@0.6.4, text-encoding@^0.6.4:
   version "0.6.4"
   resolved "https://registry.yarnpkg.com/text-encoding/-/text-encoding-0.6.4.tgz#e399a982257a276dae428bb92845cb71bdc26d19"
 
-type-detect@^4.0.0:
-  version "4.0.3"
-  resolved "https://registry.yarnpkg.com/type-detect/-/type-detect-4.0.3.tgz#0e3f2670b44099b0b46c284d136a7ef49c74c2ea"
+type-detect@^4.0.0, type-detect@^4.1.0:
+  version "4.1.0"
+  resolved "https://registry.yarnpkg.com/type-detect/-/type-detect-4.1.0.tgz#deb2453e8f08dcae7ae98c626b13dddb0155906c"
+  integrity sha512-Acylog8/luQ8L7il+geoSxhEkazvkslg7PSNKOX59mbB9cOveP5aq9h74Y7YU8yDpJwetzQQrfIwtf4Wp4LKcw==
 
 type-is@~1.6.15:
   version "1.6.15"