v0.0.3

This release includes features and bug fixes, mainly:

1. Gashub module;
2. Customized upgrade module;
3. Customized Tendermint with vote pool;
4. Disable create validator operation;
5. EIP712 bug fix;

• #72 feat: add gashub module
• #79 fix: disable create validator operation
• #80 fix: EIP712 issue with uint8[] type
• #81 feat: update tendermint to enable validator updates and votepool
• #82 feat: custom upgrade module
• #83 ci: fix release flow