Support STATUS/URL attributes in ical events

[AndCycle]

No description provided.

[codecov]

Codecov Report

Merging #68 into master will decrease coverage by 0.23%.
The diff coverage is 71.42%.

@@            Coverage Diff             @@
##           master      #68      +/-   ##
==========================================
- Coverage   82.82%   82.58%   -0.24%     
==========================================
  Files           4        4              
  Lines         326      333       +7     
  Branches       77       79       +2     
==========================================
+ Hits          270      275       +5     
- Misses         31       32       +1     
- Partials       25       26       +1     

Impacted Files	Coverage Δ
icalevents/icalparser.py	82.78% <71.42%> (-0.34%)	⬇️

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[Hultner]

@AndCycle Would you like to add some tests for this change?