fixed issue with branches that contain other branch names

When a remote branch begins with or ends with the local branch name then
the commits against diff functions can report the commits for the remote
branch instead of your local branch, e.g.:

I have local branch `foo` with 1 commit ahead of master and a remote
branch `foobar` with 2 ahead of master. The prompt will report 2 commits
instead of the true 1 commit because the `grep $branch_name` returns the
`foobar` branch.

Simple fix is to ensure we grep for the full `/<branch_name>$` so:

branch_name = `foo`

`origin/foo` matches
`other/foo` matches
`origin/foobar` doesn't match
`origin/barfoo` doesn't match

0 files changed, 0 insertions, 0 deletions