Jigu

- Fixed `SlashingAPI.signing_info_by_address` default argument function due to missing `None`-check.

- Remove debug print statement in `GovernanceAPI.proposals()`

- Fix `Dec` pretty-printing issue on Jupyter
- Add `MsgInfosQuery.__contains__` support for Message classes

- Option to change coin type other than LUNA for MnemonicKey
- Add `ParamChanges` to facilitate construction of `ParameterChangeProposal`s.

- Hello Jigu!
- Let there be light

- Interface ideation
- Primordial world