Wrong commit number for release from support branches

[danielmarbach]

if you are using support branches and merge a hotfix into a support branch then the number of commits is wrongly calculated

Here are a few examples

https://github.com/Particular/NServiceBus/releases/tag/4.1.8
https://github.com/Particular/NServiceBus/releases/tag/4.0.11

[SimonCropp]

just remove it instead. doesnt add enough value

[danielmarbach]

@SimonCropp would be Ok for me as well. Not worth the complexity in the code.

@andreasohlund objections?

[andreasohlund]

+1 to remove

[timbussmann]

btw. I raised an issue for that here: #31, so you might want to close this issue @danielmarbach

[timbussmann]

(btw. just came across this one more time today)