fixing prop name canonicalization

[keighrim]

fixes #401

[codecov]

Codecov Report

❌ Patch coverage is 87.50000% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 77.34%. Comparing base (ecc064d) to head (0736e1e).

Files with missing lines	Patch %	Lines
mmif/utils/summarizer/nodes.py	72.22%	10 Missing ⚠️
mmif/utils/summarizer/summary.py	33.33%	2 Missing ⚠️
mmif/serialize/annotation.py	98.11%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #402      +/-   ##
===========================================
+ Coverage    75.04%   77.34%   +2.30%     
===========================================
  Files           27       27              
  Lines         3274     3311      +37     
===========================================
+ Hits          2457     2561     +104     
+ Misses         817      750      -67     

Flag	Coverage Δ
unittests	77.34% <87.50%> (+2.30%)	⬆️

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