tox: print python version and bitness for debugging

fixu

Author: anthrotype

tox.ini

@@ -12,6 +12,8 @@ deps =
     lxml: -rextra_requirements.txt
 extras = testing
 commands =
+  python --version
+  python -c "import struct; print('%s-bit' % (struct.calcsize('P') * 8))"
   nocov: pytest {posargs}
   cov: pytest --cov="{envsitepackagesdir}/ufoLib" --cov-config={toxinidir}/.coveragerc {posargs}