Support parsing RData files

[jkanche]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 96.77419% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.16%. Comparing base (559554a) to head (f42a7d5).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
src/rds2py/PyRdaReader.py	95.23%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #73      +/-   ##
==========================================
+ Coverage   78.40%   80.16%   +1.76%     
==========================================
  Files          16       17       +1     
  Lines         551      610      +59     
  Branches       89       93       +4     
==========================================
+ Hits          432      489      +57     
- Misses         73       75       +2     
  Partials       46       46              

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