Manypex

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* Follow redirects on HTTP requests (361)
`361 <https://github.com/pantsbuild/pex/pull/361>`_

* Fix corner case in cached dependency resolution (362)
`362 <https://github.com/pantsbuild/pex/pull/362>`_

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* Fix CacheControl import. (357)
`357 <https://github.com/pantsbuild/pex/pull/357>`_

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This release is a quick fix for a bootstrapping bug that inadvertently went out in 1.2.0 (Issue
354).

* Ensure `packaging` dependency is self-contained. (355)
`355 <https://github.com/pantsbuild/pex/pull/355>`_
`Fixes 354 <https://github.com/pantsbuild/pex/issues/354>`_

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This release changes pex requirement resolution behavior. Only stable requirements are resolved by
default now. The previous behavior that included pre-releases can be retained by passing `--pre` on
the pex command line or passing `allow_prereleases=True` via the API.

* Upgrade dependencies to modern version ranges. (352)
`352 <https://github.com/pantsbuild/pex/pull/352>`_

* Add support for controlling prerelease resolution. (350)
`350 <https://github.com/pantsbuild/pex/pull/350>`_
`Fixes 28 <https://github.com/pantsbuild/pex/issues/28>`_

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* Add dummy flush method for clean interpreter exit with python3.6 (343)
`343 <https://github.com/pantsbuild/pex/pull/343>`_

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* Implement --constraints in pex (335)
`335 <https://github.com/pantsbuild/pex/pull/335>`_

* Make sure namespace packages (e.g. virtualenvwrapper) don't break pex (338)
`338 <https://github.com/pantsbuild/pex/pull/338>`_