I just added a short explanation to the README: Yes, I knew about vim-gitgutter before, I even contributed to it. But in the end I just didn't like the codebas

I just added a short explanation to the README: Yes, I knew about vim-gitgutter before, I even contributed to it. But in the end I just didn't like the codebase and started my own plugin. And because I like programming VimL. The main difference is probably the support for other DVCS. Moreover, execution speed and high configurability are two of the design goals.