v1.6.0

Changed

• Update deprecated collections imports to collections.abc to be forward-compatible with Python3.10 (improvement)
  Contributed by @AndroxxTraxxon
• Migrate from nosetest to pytest for Python test runner. (improvement)
  Contributed by @AndroxxTraxxon
• Add Python versions 3.9, 3.10, and 3.11 to the test matrix (improvement)
  Contributed by @AndroxxTraxxon

Fixed

• Update networkx >=2.6 for Python 3.8 to fix insecure deserialization #255 (security fix)
  Contributed by @Stealthii
• Update jsonschema requirements to allow 3.2 (security fix)
  Contributed by @james-bellamy