Update dependency clay-css to v2.19.0

package.json

@@ -33,7 +33,7 @@
     "browser-monads": "1.0.0",
     "classnames": "2.2.6",
     "clay-component": "2.14.2",
-    "clay-css": "2.14.2",
+    "clay-css": "2.19.0",
     "clay-tooltip": "2.15.1",
     "gatsby": "2.0.104",
     "gatsby-mdx": "0.1.4",

yarn.lock

@@ -2662,10 +2662,10 @@ [email protected]:
     metal-dom "^2.16.0"
     metal-state "^2.16.0"
 
-clay-css@2.14.2:
-  version "2.14.2"
-  resolved "https://registry.yarnpkg.com/clay-css/-/clay-css-2.14.2.tgz#28e4410f2a46b42a9107cdbd7e6fa9f8a078ccf3"
-  integrity sha512-KaVFEeJ+hNWppAwI8NPSbA33iz1YqFbnqpS7Le3GRnTQxaeuV3pM+gcIOtslf4ABoBApcab1ykSyhgNdmLC2/Q==
+clay-css@2.19.0:
+  version "2.19.0"
+  resolved "https://registry.yarnpkg.com/clay-css/-/clay-css-2.19.0.tgz#fbe8b603aa6e396d54c397544ece4ff40cfa7f1b"
+  integrity sha512-byWj/V4I1CIr4au5KPOSI1ezKqZdR7uIMMsa7RMyD8joSquD2qMQpty8YpL9bRK3KgRR2hCUKZIiR/8iRetgHQ==
 
 [email protected]:
   version "2.15.1"