Gammapy v0.14 release

[Axel Donath]

Dear Gammapy community,

we are happy to announce the release of Gammapy v0.14.

Gammapy v0.14 comes for the first time with a config file driven high-level analysis interface.

It allows you to perform the standard 1D / 3D joint and stacked analyses with just a few lines of

Python code.  A complete summary of all recent changes can be found here:

https://docs.gammapy.org/0.14/changelog.html#sep-30-2019

Instructions how to install / update Gammapy using `conda` can be found here:

https://docs.gammapy.org/0.14/install/index.html

Please try out Gammapy v0.14 and give us feedback! Also let us know if you find any issues

or have questions of any kind, either on this mailing list, gammapy.slack.com, or via

https://github.com/gammapy/gammapy.

Thanks to all who contributed, 

Axel, for the Gammapy developer team