Merge pull request #270 from skuschel/vupdate

version bump to v0.5
last version to support python2

CHANGELOG.md

@@ -4,6 +4,15 @@ Changelog of postpic
 current master
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+
+v0.5
+----
+
+2022-10-22
+
+This is the last version with python 2 support. Changes in setuptools (see for example python [PEP 517](https://peps.python.org/pep-0517/) and [PEP 660](https://peps.python.org/pep-0660/) ) require changes in the setup. Backward compatibility will therefore be dropped. Current tests already do not inlcude python2 anymore.
+
+
 **Highlights**
 
 * Parallelized implementation of `Field.map_coordinates`