maven.py: "release" qualifier not treated as release alias #188

What: ALIASES dict in maven.py maps "ga" and "final" to "" but omits "release". So Version("1.0") == Version("1.0-release") returns False.

Expected: The Maven ComparableVersion spec defines "", "final", "ga", and "release" as equivalent.
Reference: https://maven.apache.org/pom.html#version-order-specification

Fix: Add "release": "" to the ALIASES dict on line 33 of univers/maven.py.

Reproduction:

  assert Version("1.0") == Version("1.0-release")  # fails
  assert Version("1.0") == Version("1.0-final")    # passes
  assert Version("1.0") == Version("1.0-ga")       # passes