[AstroPy] astropy v4.0rc1 release candidate

[Brigitta Sipocz]

Dear all,

The first astropy v4.0 release candidate is now available and ready for
testing.

https://pypi.python.org/pypi/astropy/4.0rc1

We would appreciate if you could try out this RC and report back any
success or failure via the following wiki page. If you maintain any
downstream packages please check, and preferably whether they are
compatible or there are any blocking issues:

https://github.com/astropy/astropy/wiki/v4.0-RC-testing

Please also open issues for each different type of failure (please check
the issue tracker first to make sure no one has reported it earlier). In
addition of running the astropy test suite itself, we especially encourage
you to also test it with as many packages of yours as possible. There is a
section to list packages at the bottom of the wiki page.

You should be able to install the RC by doing:

pip install astropy --pre

or

pip install astropy==4.0rc1

We also made some refactoring in our testing infrastructure, so please make
sure you have the latest version of pytest-astropy, including
pytest-astropy-header installed.

If you use conda, be sure to either remove the existing conda astropy
package or make a new environment.

Happy testing,
 Brigitta
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