Fix commit link
Refactor
Merge pull request #24 from masutaka/fix-commit-link

Fix commit link
Bump version
Changelog is written in Releases section
v2

* thor + octokit
* --all option (auto pagination)
* new `ghn open` command (--open option is osbolete)
spec
pre1
Add aliases
doc
Merge branch 'v2'
Don't raise exception for unknown subject type notification
Remove `nil` from collected URLs
Merge branch 'fix-raise-for-unknown-type'
`__dir__` is not compatible for Ruby 1.9.x
Merge branch 'ruby19'
Fix build

- Drop rbx
- Add 2.1.1
Merge branch 'fix-travis-build'
Bump version
Add Release type notification JSON payload and test case