How can I update my package?

Hm, fails towards the end of the build here…

Successfully built TermCheat urwid pyyaml python-Levenshtein
Looking in links: /root/parts/term-cheat/python-packages
Collecting urwid
Collecting appdirs
Collecting TermCheat
Collecting fuzzywuzzy
Collecting PyYAML
Collecting python_Levenshtein
Installing collected packages: urwid, appdirs, TermCheat, fuzzywuzzy, PyYAML, python-Levenshtein
Successfully installed PyYAML-3.13 TermCheat-0.1.4 appdirs-1.4.3 fuzzywuzzy-0.17.0 python-Levenshtein-0.12.0 urwid-2.0.1
/root/parts/term-cheat/install/usr/bin/python3 setup.py --no-user-cfg install --single-version-externally-managed --user --record install.txt
/root/parts/term-cheat/install/usr/lib/python3.6/distutils/dist.py:261: UserWarning: Unknown distribution option: 'entry_points'
  warnings.warn(msg)
/root/parts/term-cheat/install/usr/lib/python3.6/distutils/dist.py:261: UserWarning: Unknown distribution option: 'install_requires'
  warnings.warn(msg)
usage: setup.py [global_opts] cmd1 [cmd1_opts] [cmd2 [cmd2_opts] ...]
   or: setup.py --help [cmd1 cmd2 ...]
   or: setup.py --help-commands
   or: setup.py cmd --help

error: option --single-version-externally-managed not recognized
Staging python-wrapper 
Staging term-cheat 
Priming python-wrapper 
Priming term-cheat 
Determining the version from the project repo (version: git).
The version has been set to '0+git.3ce6807'
Snapping 'term-cheat' \                                                                                                                                       
Snapped term-cheat_0+git.3ce6807_amd64.snap

Might need some help from @sergiusens