Add Pharo 13 support

[gcotelli]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.82%. Comparing base (c294e22) to head (08c3c4d).
Report is 31 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #164      +/-   ##
==========================================
+ Coverage   77.77%   77.82%   +0.05%     
==========================================
  Files         470      470              
  Lines       50332    50341       +9     
==========================================
+ Hits        39144    39177      +33     
+ Misses      11188    11164      -24     

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