BLD: prepare for new release (mie-lab#461)

Update conf.py

ENH: add centroid method for angles (mie-lab#453)

* ENH: add centroid method for angles

* BUG: add missing index to centroid output

* BUG: Fix angle median bug for sp

* CLN: black

* CLN: give up and adapt test

* TST: Add test for planar crs

Update release

Update conf.py

Update conf.py

Update version number and added Nina as author

BLD: new release number (mie-lab#402)

BLD: release 1.1.5 (mie-lab#364)

BLD: new version release (mie-lab#324)