v1.13.1

This regular maintenance release addresses minor bugs and dependency issues.

• CLI: replace bullet with questionary (#777 @bshifaw)
• make JSON pair definitions case-insensitive (#789 @stxue1)
• fix asyncio.get_event_loop() error in newer Python versions (#791 #793 @wleepang)
• migrate pkg_resources usage to importlib_metadata (#794 #802 @hexylena)
• fix miniwdl configure --cfg FILENAME_IN_CWD.cfg (#805 @hexylena)
• ensure static type error for unknown fields in struct literals (#808 @gshiba)

Internal refactoring and implementation for WDL 1.2 continues in the background!