fix: plugin klen/python-mode already change to python-mode/python-mode

Author: zhenglisheng

.vimrc.bundles

@@ -202,7 +202,7 @@
     " Python {
         if count(g:spf13_bundle_groups, 'python')
             " Pick either python-mode or pyflakes & pydoc
-            Bundle 'klen/python-mode'
+            Bundle 'python-mode/python-mode'
             Bundle 'yssource/python.vim'
             Bundle 'python_match.vim'
             Bundle 'pythoncomplete'