Suport # character in path of tox project

[gaborbernat]

Resolves #763.

[codecov]

Codecov Report

Merging #2146 (af256fe) into rewrite (174fd08) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff            @@
##           rewrite    #2146   +/-   ##
========================================
  Coverage    99.85%   99.85%           
========================================
  Files          157      157           
  Lines         8767     8786   +19     
  Branches       918      920    +2     
========================================
+ Hits          8754     8773   +19     
  Misses           3        3           
  Partials        10       10           

Flag	Coverage Δ
tests	99.85% <100.00%> (+<0.01%)	⬆️

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Impacted Files	Coverage Δ
src/tox/config/loader/ini/__init__.py	100.00% <100.00%> (ø)
src/tox/config/loader/ini/replace.py	100.00% <100.00%> (ø)
src/tox/config/loader/str_convert.py	100.00% <100.00%> (ø)
src/tox/config/set_env.py	100.00% <100.00%> (ø)
src/tox/pytest.py	100.00% <100.00%> (ø)
tests/session/cmd/test_show_config.py	100.00% <100.00%> (ø)

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[jugmac00]

I am late to the party, but changes look good. Thanks!