Revert "Add use_2to3 keyword to setup()."

[blueyed]

Appears to not be necessary anymore (at least no changes for py37 for
me), and prevents editable installs.

Initially done for #16.

This reverts commit d86c166.

[codecov-io]

Codecov Report

Merging #173 into master will increase coverage by 0.76%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #173      +/-   ##
==========================================
+ Coverage   38.85%   39.62%   +0.76%     
==========================================
  Files           5        5              
  Lines         157      159       +2     
==========================================
+ Hits           61       63       +2     
  Misses         96       96

Impacted Files	Coverage Δ
setup.py	100% <ø> (ø)	⬆️
ipdb/__main__.py	26.36% <0%> (+0.67%)	⬆️
ipdb/stdout.py	44.44% <0%> (+2.13%)	⬆️

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[gotcha]

@blueyed Do you need a release ?

[blueyed]

@gotcha
No, thanks for asking.. :)

btw: I was looking at it since I will likely drop the dependency on fancycompleter/pyrepl from pdb++ (make it optional), since it works pretty good through ipdb/ipython, which has better completion via Jedi then.

You might want to try it (use master, the last release is old - https://github.com/pdbpp/pdbpp/): when using ipdb.set_trace the hijacking of pdb++ makes it being used there then also.

[gotcha]

@blueyed Thanks for the pointer ! I did not know there was a way to override pdb. The fact I need to be explicit about ipdb is the main reason why I dont use it as regularly as I wish.