v0.1.3 shell completions

Add shell completions.
Fix typos.

Soon(and of course, no promises), the mode option for git diff and git diff --word-diff will be released.

I'm thinking of this.
Piping git-diff stdout will create the contents of two fields.
Piping git-diff --word-diff stdout will create the content of a cloze field.
This will require --tag options or environment variables.

v0.1.2 minor fixes

Now --sync option will print an error handle message correctly.

TIL: update GitHub first, publish PyPI later.