Merge pull request #2734 from msabramo/patch-1

README.md: Make docs URL a link

README.md

@@ -74,4 +74,4 @@ Usage
 The complete documentation for Protocol Buffers is available via the
 web at:
 
-    https://developers.google.com/protocol-buffers/
+https://developers.google.com/protocol-buffers/