Updated repo URL

Incognito · Incognito · commit d9f6df1c077d · 2015-06-15T09:34:23.000-04:00
`git clone git@github.com:StanAngeloff/php.vim.git` does not work for users who have not configured SSH and github to work this way. It results in `Permission denied (publickey).`

Clone over HTTPS works for anyone who hits the page.
diff --git a/README.md b/README.md
@@ -15,7 +15,7 @@ If you don't have a preferred installation method, [pathogen.vim](https://github
 
 ```bash
 cd ~/.vim/bundle
-git clone git@github.com:StanAngeloff/php.vim.git
+git clone https://github.com/StanAngeloff/php.vim.git
 ```
 
 Configuration
