Add parse method

[joanllenas]

Add parse method to Decoder class that throws an error on failure.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.87%. Comparing base (b264fb0) to head (c9dbca3).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #55      +/-   ##
==========================================
+ Coverage   96.75%   96.87%   +0.11%     
==========================================
  Files          38       36       -2     
  Lines        1695      288    -1407     
  Branches      155       76      -79     
==========================================
- Hits         1640      279    -1361     
+ Misses         55        9      -46     

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