clarify reason for fork, and maintenance strategy

[aspiers]

Hi there,

Thanks a lot for sharing this! Please could you clarify why git-gutter-plus was created, and what are the plans for its future? It seems to be a fork of git-gutter, and the README says "It contains patches that haven't yet been added to Git-Gutter", but is the intention to act as a friendly fork and submit these patches back to git-gutter, or will it remain diverged? It would be really helpful to clarify the differences between the two projects, and what are the long-term intentions around how they are maintained, so that users are not confused and can make a well-educated choice which one to use.

Thanks again!