Fixes #200 - improve formatting of compat table

Author: addyosmani

README.md

@@ -28,12 +28,12 @@ Pre-built (concatenated & minified) versions of the polyfills are maintained in
 Our polyfills are intended to work in the latest versions of evergreen browsers. See below
 for our complete browser support matrix:
 
-|   | IE10 | IE11+ | Chrome* | Firefox* | Safari 7+* | Chrome Android* | Mobile Safari* |
-|---|:---:|:---:|:---:|:---:|:---:|:---:|
-| __Custom Elements__ | ~ | ✓ | ✓ | ✓ | ✓ | ✓| ✓
-| __HTML Imports__ | ~ | ✓ | ✓ | ✓ | ✓| ✓| ✓
-| __Shadow DOM__ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓
-| __Templates__ | ✓ | ✓ | ✓ | ✓| ✓ | ✓ | ✓
+| Polyfill   | IE10 | IE11+ | Chrome* | Firefox* | Safari 7+* | Chrome Android* | Mobile Safari* |
+| ---------- |:----:|:-----:|:-------:|:--------:|:----------:|:---------------:|:--------------:|
+| Custom Elements | ~ | ✓ | ✓ | ✓ | ✓ | ✓| ✓ |
+| HTML Imports | ~ | ✓ | ✓ | ✓ | ✓| ✓| ✓ |
+| Shadow DOM | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
+| Templates | ✓ | ✓ | ✓ | ✓| ✓ | ✓ | ✓ |
 
 
 *Indicates the current version of the browser