Checking in changes prior to tagging of version v0.10.2
## [v0.10.2](https://github.com/Songmu/ghch/compare/v0.10.1...v0.10.2) (2020-01-21)
* update deps [#31](https://github.com/Songmu/ghch/pull/31) ([Songmu](https://github.com/Songmu))
* adjust releng [#30](https://github.com/Songmu/ghch/pull/30) ([Songmu](https://github.com/Songmu))
* handle nil github.User in reduceUser, avoid segfault [#29](https://github.com/Songmu/ghch/pull/29) ([pda](https://github.com/pda))
* changelog_test: TestMarkdown for ghch.Section.toMkdn [#28](https://github.com/Songmu/ghch/pull/28) ([pda](https://github.com/pda))