Checking in changes prior to tagging of version v0.0.4
## [v0.0.4](https://github.com/Songmu/gocredits/compare/v0.0.3...v0.0.4) (2019-04-16) * use "go env" instead of using runtime.GOPATH() and build.Default.GOPATH [#4](https://github.com/Songmu/gocredits/pull/4) ([Songmu](https://github.com/Songmu))