Why

#147 made a couple of breaking changes to the CLI:

• removed python-python2-poetry backend
• simplified python-python3-poetry backend name to python3-poetry

unfortunately, the latter change will cause all upm caches to be invalidated, and invocations of upm -l python-python3-poetry will break.

What changed

• Added Alias field to api.LanguageBackend
• When resolving the backend via -l flag, if resolving via Name of the LanguageBackend fails, try to resolve against the Alias
• The logic for reading from the cache store is now:
  • check if there's a match for Name, if there is then use that cache
  • check if there's a match for Alias, if there is then use that cache
• The logic for creating a cache entry in the store is now:
  • check if there's a match for Name, exit function if true
  • check if there's a match for Alias, exit function if true
  • create an entry for Name