Chanfig

Commits
- d73483f: allow use init to avoid calling super().__init__() (Zhiyuan Chen)
- 5e6c7c7: update actions (Zhiyuan Chen)
- cc7abac: !add Variable to wrap the immutable (Zhiyuan Chen)

Commits
- 00bdfa5: use jsons/yamls in json/yaml (Zhiyuan Chen)

Commits
- 584b4ec: add default_mapping attr for convert_mapping (Zhiyuan Chen)
- 53e3fde: add = in cli (Zhiyuan Chen)

Commits
- 041a1b0: fix get not working properly in nesteddict (Zhiyuan Chen)

Commits
- b5187b9: rewrite get (Zhiyuan Chen)