Remove attributes that give deprecation warnings in some circumstances

With some test environments, these attribute settings give:
  DeprecationWarning: Implicit None on return values is deprecated and
  will raise KeyErrors.

As far as I can tell, these aren't needed, so I'm removing them.

See #140 for details.

Resolves #140

src/addon/esmpy/src/esmpy/__init__.py

@@ -102,10 +102,6 @@
 __description__ = msg["Summary"]
 __requires__ = msg["Requires-Dist"]
 __requires_python__ = msg["Requires-Python"]
-# these don't seem to work with setuptools pyproject.toml
-__author__ = msg["Author"]
-__homepage__ = msg["Home-page"]
-__obsoletes__ = msg["obsoletes"]
 
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