[py27] Remove last traces of py27

[Djailla]

No description provided.

[codecov-io]

Codecov Report

Merging #392 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #392      +/-   ##
==========================================
- Coverage   90.63%   90.63%   -0.01%     
==========================================
  Files          43       43              
  Lines        2915     2914       -1     
==========================================
- Hits         2642     2641       -1     
  Misses        273      273

Impacted Files	Coverage Δ
django_q/core_signing.py	84.61% <ø> (-0.39%)	⬇️
django_q/admin.py	100% <ø> (ø)	⬆️

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[Djailla]

Hello @Koed00 despite the coverage reporting a lower score, I think this PR could be merged. What do you think ?

Regards