Issue title: Weird version tag name
 Issue body: It seems [`v7.2.0`](https://github.com/jcmturner/gokrb5/releases/tag/v.7.2.0) is a typo. It is actually `v.7.2.0` instead of `v7.2.0`.
 Comments: 
 Comment 0: thanks for pointing that out, should be fixed now
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