Hide wheels directory used on Debian-like systems (Ubuntu)

See https://www.debian.org/doc/packaging-manuals/python-policy/ch-module_packages.html

tl;dr Debian Policy requires wheels to be installed here and thus issuing
python3 -m venv .
on a Debian-like system creates this directory

Python.gitignore

@@ -20,6 +20,7 @@ parts/
 sdist/
 var/
 wheels/
+share/python-wheels/
 *.egg-info/
 .installed.cfg
 *.egg