Merge pull request git-bug#363 from MichaelMure/gitlab-iterator

gitlab: refactor the iterator, fix bug

Merge pull request git-bug#281 from MichaelMure/howto-github

add a how-to to explain usage with Github

termui: fix an excessive assumption about an error

travis: enable go 1.12, build release with go 1.11

version 0.4.0

version 0.3.0

version 0.2.0

build: someday travis will stop complaining