docs: update to 5.2 (#159)

Author: gerhardol

source/conf.py

@@ -49,9 +49,9 @@
 #
 # The short X.Y version.
 #Note: Does not seem to be used so 'full' version is OK
-version = '5.1'
+version = '5.2'
 # The full version, including alpha/beta/rc tags.
-release = '5.1'
+release = '5.2'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.