optparse-declarative-0.3.1: ChangeLog.md

# 0.3.1

- Allow False as a default value for Bool arguments [#2](https://github.com/tanakh/optparse-declarative/pull/2)
- Make `[]` a `IsCmd` instance [#6](https://github.com/tanakh/optparse-declarative/pull/6)
- Fix typo in README [#1](https://github.com/tanakh/optparse-declarative/pull/1)

# 0.3.0

- Simplify API
- Support -vv -vvv verbosity
- Improve help message

# 0.2.0

- Verbosity support

# 0.1.0

- First release