Pywikibot is cleaning up ist code and some old deprecated compat compatiblity parts will be removed. With README-conversion.txt the framework has guide to converting bot scripts from version 1 (compat) of the Pywikibot framework to version 3 (core). And there is a maintenance script called compat2core.py which is supports converting a script.
Refer https://www.mediawiki.org/wiki/Manual:Pywikibot/compat-to-core_conversion for conversion instructions.
Anyway if you need any conversion support please ask here.