Fix markdown syntax (#662)

lovasoa · Jonathan Neal · commit 790b3b3ffee0 · 2017-03-28T09:08:35.000-04:00
diff --git a/README.md b/README.md
@@ -76,8 +76,8 @@ browsers. [Source](https://gist.github.com/413930).
 
 Adding `overflow: hidden` fixes IE9's SVG rendering. Earlier versions of IE
 don't support SVG, so we can safely use the `:not()` and `:root` selectors that
-modern browsers use in the default UA stylesheets to apply this style. [Source]
-(https://lists.w3.org/Archives/Public/public-svg-wg/2008JulSep/0339.html).
+modern browsers use in the default UA stylesheets to apply this style.
+[Source](https://lists.w3.org/Archives/Public/public-svg-wg/2008JulSep/0339.html).
 
 #### `select`
 
