Feature/partnership cb function

[chadgates]

As discussed in https://github.com/abhishek-ram/django-pyas2/issues/21

[codecov[bot]]

Codecov Report

Merging #46 (1e563b2) into master (29591b4) will increase coverage by 0.01%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #46      +/-   ##
==========================================
+ Coverage   96.46%   96.48%   +0.01%     
==========================================
  Files           6        6              
  Lines         736      739       +3     
  Branches      131      132       +1     
==========================================
+ Hits          710      713       +3     
  Misses         14       14              
  Partials       12       12              

Impacted Files	Coverage Δ
pyas2lib/as2.py	97.45% <100.00%> (+0.01%)	:arrow_up:

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[chadgates]

Now covered in PR #65