Checking in changes prior to tagging of version v0.1.0

## [0.1.0](https://github.com/Songmu/make2help/compare/v0.0.2...0.1.0) (2019-02-21)

* Introduce go modules and update releng tools [#5](https://github.com/Songmu/make2help/pull/5) ([Songmu](https://github.com/Songmu))
* use standard sort package and drop patrickmn/sortutil [#4](https://github.com/Songmu/make2help/pull/4) ([Songmu](https://github.com/Songmu))
* introduce xerrors [#3](https://github.com/Songmu/make2help/pull/3) ([Songmu](https://github.com/Songmu))
* support each phony style [#2](https://github.com/Songmu/make2help/pull/2) ([Songmu](https://github.com/Songmu))