Branch names with '/' don't display correctly
For instance, displaying the status of a branch named `bug/1234` will output a branch name of `bug`.

diff --git a/core/git_mixins/active_branch.py b/core/git_mixins/active_branch.py
index f044f5d9..0cf3c8bb 100644
--- a/core/git_mixins/active_branch.py
+++ b/core/git_mixins/active_branch.py
@@ -34,7 +34,7 @@ class ActiveBranchMixin():
         if first_line.startswith("## Initial commit on "):
             return "Initial commit on `{}`.".format(first_line[21:])
 
-        short_status_pattern = r"## ([A-Za-z0-9\\-_]+)(\\.\\.\\.([A-Za-z0-9\\-_\\/]+)( \\[((ahead (\\d+))(, )?)?(behind (\\d+))?\\])?)?"
+        short_status_pattern = r"## ([A-Za-z0-9\\-_\\/]+)(\\.\\.\\.([A-Za-z0-9\\-_\\/]+)( \\[((ahead (\\d+))(, )?)?(behind (\\d+))?\\])?)?"
         status_match = re.match(short_status_pattern, first_line)
 
         if not status_match:
['core/git_mixins/active_branch.py']