fix docs

See merge request !12

as they have been changed in !11

has accidently been removed in !11

migrate to psyplot plugin template

See merge request !11

numpy 1.*

As with psyplot 1.4.0, psy-reg is now continuously tested and deployed with CircleCI.

Fixed
-----
-   psy-reg is now officially licensed under LGPL-3.0-only, see [#9](https://github.com/psyplot/psy-reg/pull/9)

Added
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-   psy-reg does now have a CITATION.cff file, see <https://citation-file-format.github.io>

Changed
-------
-   Documentation is now hosted with Github Pages at <https://psyplot.github.io/psy-reg>. Redirects from the old documentation at [https://psy-reg.readthedocs.io]{.title-ref} have been configured.
-   Examples have been removed from the psy-reg repository as they now live in a central place at <https://github.com/psyplot/examples>
-   We use CicleCI now for a standardized CI/CD pipeline to build and test the code and docs all at one place, see [#8](https://github.com/psyplot/psy-reg/pull/8)

* add circleci config

* minor fix for tests

use versioneer for version control

as this has been changed in 82427a7d33219c6f8f434b76d2dea7b8b44c9a44

Gh migration

and applied several other commits, with reference to https://github.com/psyplot/psy-maps/commit/7d75bc4d9f0ed73512453849afdc58dd2c40ddb5 and https://github.com/psyplot/psy-maps/commit/e5786c99e39a88feb868780cfd77cd206b3f647f

removed in 12d9b329 and accidently introduced again in 063f064c