[GIT] Fix bash completions

Hub break git completions, see mislav/hub#2684

Author: dylanpinn

bash/.bashrc.d/completion.bash

@@ -1,3 +1,4 @@
 # Bash completion.
+
 # shellcheck source=/dev/null
 [[ -r "$(brew --prefix)/etc/profile.d/bash_completion.sh" ]] && . "$(brew --prefix)/etc/profile.d/bash_completion.sh"