Add changes to whatsnew

doc/whatsnew/v0-2-2.rst

@@ -1,6 +1,11 @@
 v0.2.2 ()
 ++++++++++++++++++++++++++++++
 
+* Updated the code basis to work for newer versions of python (support for python 3.6 to
+  python 3.9 is discontinued, supported python versions are now >= python 3.9) and added
+  github actions to run tests automatically when changes are pushed to github
+  (`PR 136 <https://github.com/wind-python/windpowerlib/pull/136>`_).
+
 Contributors
 ############
- * Author
+ * Birgit Schachler