release prep 1.7.1 (#71)

* release prep 1.7.1

(maint) release_v1.7.0 prep (#67)

release prep v1.6.2

Merge pull request #63 from drone/release/1.6.1

Release/1.6.1

Merge pull request #60 from tphoney/add_steps_fields

(feat) adding depends_on, image and detached fields to step

add repo concurrency setting

Merge pull request #47 from matsubara0507/fix-repo-counter-type-to-patch

Change `RepoPatch.Counter` type to `int64` from `int`

include status code in error struct