codebuild message improvement

[fernandoaguilar]

I modified the codebuild message a bit, to add a little more helpful info. My modifications add the github hash and link to github commit page, also message is more compact than the original. I can submit a PR if anyone prefers my message style, or if you dont like my message style or think it can be improved, let me know.

My code changes currently only work with github as the source though. Im not sure what the url structures would be with codecommit or bitbucket.

original message

My modified message

PS
I also modified the CodeDeploy message.