v1.3.0

viewing bare repositories with --git-dir="$HOME/.dotfiles" --work-tree="$HOME"
New features:
- --git-dir and --work-tree
  commit be783ae31af69e2cc0a185254dbb88665e854c69
  commit 2407867f5be256c5710aa35aecf53c05a1f7afc1
- --arg=value syntax
  commit aab0c01750c54df75633a373fb6406869afc6d28

- yank --verbose
  commit 3e526aea100c45b0920d29c69d92060f6ef96e28

Help:
- gitl --help: added references to git help revisions and git help cli
  commit 896c1d3f08870aaa42f2dcd122be3d7f85a5a968
- intro: added references to git help git and git help --guides
  commit 96c2f1aa9527ace5711c2198d30955fbae5041ee