Update changelog, fix version number consistency (#842)

Bump version to 3.7.4 (#837)

add reason to leave callback (#833)

trace reason why phone reservation is leave

Signed-off-by: Jussi Vatjus-Anttila <jussiva@gmail.com>

Fix deploy to DockerHub

Release 3.7.1 (#809)

* Update CHANGELOG.md with version 3.7.1

* Release 3.7.1

Release 3.7.0 (#802)

* Update version to 3.7.0 in package.json

* Update CHANGELOG.md with version 3.7.0

Update version to 3.6.8 (#767)

Update version to 3.6.7 in package.json (#762)

Release 3.6.6 (#696)

* Release 3.6.6

* Update CHANGELOG.md

Release 3.6.5 (#649)

* devicefarmer dependency versions bump

* STF service apk version bump