change fugitive submodule to point to https:// instead of git://

.gitmodules

@@ -30,7 +30,7 @@
 	url = https://github.com/tpope/vim-surround.git
 [submodule "vim/bundle/fugitive"]
 	path = vim/bundle/fugitive
-	url = git://github.com/tpope/vim-fugitive.git
+	url = https://github.com/tpope/vim-fugitive.git
 [submodule "vim/bundle/ackmore"]
 	path = vim/bundle/ackmore
 	url = https://github.com/jordansissel/vim-ackmore.git