fix(ext/codehilite): ValueError in parse_extras (closes #147)

[llllvvuu]

closes #147

[frostming]

Good catch, thanks

[codecov]

Codecov Report

Patch coverage: 70.00% and project coverage change: -0.15 ⚠️

Comparison is base (cc43584) 96.86% compared to head (f1a9703) 96.71%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #148      +/-   ##
==========================================
- Coverage   96.86%   96.71%   -0.15%     
==========================================
  Files          19       19              
  Lines        1880     1889       +9     
  Branches      320      321       +1     
==========================================
+ Hits         1821     1827       +6     
- Misses         30       32       +2     
- Partials       29       30       +1     

Flag	Coverage Δ
unittests	96.71% <70.00%> (-0.15%)	⬇️

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

Impacted Files	Coverage Δ
marko/ext/codehilite.py	92.10% <70.00%> (-7.90%)	⬇️

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