Change bundles to bundle at "Updating to the latest version" section,…

… to solve "Warning in snipMate.vim: Snippet case is already defined..." error, because bundle's directory is at ~/.vim/bundle not ~/.vim/bundles

README.md

@@ -23,7 +23,7 @@ Link vimrc, and gvimrc
     git pull
     git submodule sync
     git submodule update --init --recursive
-    rm -rf ~/.vim/bundles/snipmate/snippets
+    rm -rf ~/.vim/bundle/snipmate/snippets
 
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