Commitizen

Fix

- add sponsors to README

Feat

- **defaults.py**: add always_signoff config option for commits

Fix

- empty error on bump failure

Feat

- **provider**: add npm2 provider to update package.json, package-lock.json, and npm-shrinkwrap.json

Fix

- **provider**: fix npm version provider to update package-lock.json and npm-shrinkwrap.json if they exist
- **provider**: fix npm provider to update package-lock.json and npm-shrinkwrap.json if they exist
- **test**: pass correct type to get_package_version tests
- **tests**: completed test coverage for npm2

Feat

- **changelog.py**: add encoding to get_metadata
- **unicode**: add unicode support

Fix

- add missing `encoding` parameter
- **out.py**: `TextIOWrapper.reconfigure` typing
- correct type hinting
- use base config for encoding

Refactor

- **defaults.py**: use variables in `DEFAULT_SETTINGS`

Refactor

- replace SemVer type literals by respective constants