Chage URL for Pathogen clone to use the gtm-vim-plugin

Author: pablorocka

README.md

@@ -13,7 +13,7 @@ Installing GTM is a two step process.  First, it's recommended you install the G
     - **Plug** `Plug 'git-time-metric/gtm-vim-plugin'`
     - **NeoBundle** `NeoBundle 'git-time-metric/gtm-vim-plugin'`
     - **Vundle** `Plugin 'git-time-metric/gtm-vim-plugin'`
-    - **Pathogen** `git clone https://github.com/git-time-metric/gtm ~/.vim/bundle/gtm`
+    - **Pathogen** `git clone https://github.com/git-time-metric/gtm-vim-plugin.git ~/.vim/bundle/gtm`
 
 **Note** - to enable time tracking for a Git repository, you need to initialize it with `gtm init` otherwise it will be ignored by GTM. This is done via the command line.
 ```