[Rev 01] RFR: 344: PR should warn when source branch is an upstream branch

[Erik Helin]

On Tue, 31 Mar 2020 13:52:11 GMT, Robin Westberg <rwestberg at openjdk.org> wrote:

>> Erik Helin has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Make HostedBranch a class
>
> Looks good!

Thanks @rwestberg for reviewing! Based on a offline discussion I changed `HostedBranch` from being an `interface` to a
`class`.

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PR: https://git.openjdk.java.net/skara/pull/555