Allow Googlebot and older browsers to render HeadProvider (#63)

* Allow Googlebot and older browsers to render HeadProvider

Per [MDN](https://developer.mozilla.org/en-US/docs/Web/API/NodeList) the `NodeList` returned by `querySelectorAll` only supports `forEach` in modern browsers. The most notable browser missing off this list if Chromium ~41, which is the rendering ending that Googlebot is based on. By removing the `NodeList` `forEach` call, also per the MDN article, we can get Google rendering again.

* Use old school way of node removal

* Update size snapshot

* Revert `remove` change

* Add workaroudn explanation

.size-snapshot.json

@@ -1,23 +1,23 @@
 {
   "dist/index.umd.js": {
-    "bundled": 7804,
-    "minified": 3404,
-    "gzipped": 1401
+    "bundled": 7905,
+    "minified": 3433,
+    "gzipped": 1408
   },
   "dist/index.min.js": {
-    "bundled": 7674,
-    "minified": 3291,
-    "gzipped": 1350
+    "bundled": 7775,
+    "minified": 3320,
+    "gzipped": 1356
   },
   "dist/index.cjs.js": {
-    "bundled": 6456,
-    "minified": 3628,
-    "gzipped": 1281
+    "bundled": 6557,
+    "minified": 3657,
+    "gzipped": 1289
   },
   "dist/index.esm.js": {
-    "bundled": 6068,
-    "minified": 3315,
-    "gzipped": 1187,
+    "bundled": 6169,
+    "minified": 3344,
+    "gzipped": 1195,
     "treeshaked": {
       "rollup": {
         "code": 420,

src/HeadProvider.js

@@ -63,7 +63,8 @@ export default class HeadProvider extends React.Component {
 
   componentDidMount() {
     const ssrTags = document.head.querySelectorAll(`[data-rh=""]`);
-    ssrTags.forEach(ssrTag => ssrTag.remove());
+    // `forEach` on `NodeList` is not supported in Googlebot, so use a workaround
+    Array.prototype.forEach.call(ssrTags, ssrTag => ssrTag.remove());
   }
 
   render() {