[release candidate] pantsbuild.pants 1.3.1rc1

[John Sirois]

The second release candidate for 1.3.1 is now available on pypi. The complete list of changes is in the release notes.

Please help to test this release in your repos to ensure an excellent and stable final 1.3.1!

Thanks to everyone who contributed changes that made it into this release:

      2 Stu Hood

      1 John Sirois

[Stu Hood]

Two more issue have been discovered in this release candidate, so a 1.3.1rc2 will be coming soon!

https://github.com/pantsbuild/pants/pull/5122

https://github.com/pantsbuild/pants/pull/5134

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@stuhood