Turn off Python27 tests

[midhun-pm]

Fix #381

[codecov-io]

Codecov Report

Merging #384 into master will decrease coverage by 4.61%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #384      +/-   ##
==========================================
- Coverage   33.33%   28.71%   -4.62%     
==========================================
  Files         206      206              
  Lines       18273    18273              
  Branches     2470     2470              
==========================================
- Hits         6091     5247     -844     
- Misses      11789    12703     +914     
+ Partials      393      323      -70

Impacted Files	Coverage Δ
enable/layout/ab_constrainable.py	0% <0%> (-100%)	⬇️
enable/layout/constraints_namespace.py	0% <0%> (-100%)	⬇️
enable/layout/api.py	0% <0%> (-100%)	⬇️
enable/layout/utils.py	0% <0%> (-100%)	⬇️
enable/layout/linear_symbolic.py	0% <0%> (-100%)	⬇️
enable/layout/geometry.py	0% <0%> (-94.21%)	⬇️
enable/constraints_container.py	0% <0%> (-80.87%)	⬇️
enable/layout/layout_manager.py	0% <0%> (-72.53%)	⬇️
enable/layout/layout_helpers.py	0% <0%> (-69.74%)	⬇️
enable/coordinate_box.py	32.65% <0%> (-37.42%)	⬇️
... and 11 more

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[corranwebster]

Looks good