RFR: git-pr: add summary sub-command [v3]

[Jorn Vernee]

On Thu, 9 Jul 2020 10:48:13 GMT, Erik Helin <ehelin at openjdk.org> wrote:

>> Hi all,
>> 
>> please review this patch that adds the `git pr summary` sub-command which corresponds to the
>> [`/summary`](https://wiki.openjdk.java.net/display/SKARA/Pull+Request+Commands#PullRequestCommands-/summary) pull
>> request command. Contributors who prefer to use the command-line can now run `git pr summary` which will open their
>> configured editor for writing a summary.  Testing:
>> - [x] Manual testing on Linux x64
>> 
>> Thanks,
>> Erik
>
> Erik Helin has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Add --remove switch

Marked as reviewed by jvernee (Reviewer).

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PR: https://git.openjdk.java.net/skara/pull/700