Tarjinja

Features
- add GitInput 12

Feature
- value + value-from (merge) 9
- var-namesサポートを追加 10

Bug Fix
- Jinja2: keep trailing newline 8

Feature
- add var-names subcommand 5 7

Bug Fix
- fix DirOutput to relative path 6

New Features
- add filters (Mako, Null)
- read value from `git config`, `hub api user`
- reverse filter now escape format tag

Others
- refactor
- CI (GitHub Actions)