Trying out an idea of an issues attachment to list issue ids
Of course, I messed up some element names in my haste, extracted them to constants like they always should have been.
made the issue ids clickable with the issue urls
color setting for issues attachment set to match committers. I think this might help with the short thing not putting them on the same row? Fixed some var name spelling
Remove web token config element. Just one post url to configure.

Put the new slack url format in post url config element , should also probably work with the old format with a web token query string param. There was really no need for 2 settings as it just concatenated them together anyway.
Fixes #15
update version for release of 2.4.0
readme updates
added a change log file
Release version 2.4.0