Support backward compatibility for Quince earlier releases

[farhan]

• ticket: Remove xblockutils package #23
• Support backward compatibility for Quince earlier releases
• Update release version

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (9e25dcc) 91.53% compared to head (203657b) 90.22%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #38      +/-   ##
==========================================
- Coverage   91.53%   90.22%   -1.32%     
==========================================
  Files           1        1              
  Lines         130      133       +3     
==========================================
+ Hits          119      120       +1     
- Misses         11       13       +2     

Flag	Coverage Δ
unittests	90.22% <50.00%> (-1.32%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
feedback/feedback.py	90.22% <50.00%> (-1.32%)	⬇️

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