Fix travis link.

Author: rebornix

README.md

@@ -9,7 +9,7 @@
     <a href="http://aka.ms/vscodevim">
         <img src="http://vsmarketplacebadge.apphb.com/version/vscodevim.vim.svg" alt="Version">
     </a>
-    <a href="https://travis-ci.org/VSCodeVim/Vim.svg?branch=master">
+    <a href="https://travis-ci.org/VSCodeVim/Vim">
         <img src="https://travis-ci.org/VSCodeVim/Vim.svg?branch=master" alt="Build Status">
     </a>
     <a href="https://vscodevim-slackin.azurewebsites.net">