Finished release 1.2.3 (merge into develop)
release stage: Check Jenkins URL

After getting the Jenkins URL from the user, a GET is issues to that
address to see if it is a valid URL and that it is actually reachable.
Finished feature 64057664/reenter-the-jenkins.
Update README.rst

Mention git flow release append
init: Check remote URL to be compatible with RB
Finished feature 66314666/check-RB-compatible-URL.
pick(): Exit if no values are available
Finished feature 66764710/if-i-dont-have-access-to.
Bump version to 1.2.4
Finished release 1.2.4 (merge into master)