vformat-0.12.0.0: ChangeLog.md

# Changelog for vformat

## V0.10.0
- Rewrite error system & fix bugs
- Fix document
- Rewrite unit tests

## V0.11.0
- Simplify `ArgKey`
- Make generic instantiate FormatArg configurable
- Expose standard formatters
- Fix some issue and doc

## V0.12.0
- Add `defaultSpecs`
- Remove `FormatTime` instance