Add support for relay candidates

[mickel8]

closes #9
related to #8

[codecov]

Codecov Report

Merging #33 (d1517bb) into master (1b57c79) will increase coverage by 2.22%.
Report is 2 commits behind head on master.
The diff coverage is 82.34%.

❗ Current head d1517bb differs from pull request most recent head d81b178. Consider uploading reports for the commit d81b178 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #33      +/-   ##
==========================================
+ Coverage   77.97%   80.20%   +2.22%     
==========================================
  Files          20       25       +5     
  Lines        1049     1283     +234     
==========================================
+ Hits          818     1029     +211     
- Misses        231      254      +23     

Files	Coverage Δ
lib/ex_ice/candidate.ex	81.25% <100.00%> (-0.81%)	⬇️
lib/ex_ice/priv/app.ex	100.00% <100.00%> (ø)
lib/ex_ice/priv/attribute/ice_controlled.ex	75.00% <ø> (ø)
lib/ex_ice/priv/attribute/ice_controlling.ex	75.00% <ø> (ø)
lib/ex_ice/priv/attribute/priority.ex	75.00% <ø> (ø)
lib/ex_ice/priv/attribute/use_candidate.ex	75.00% <ø> (ø)
lib/ex_ice/priv/candidate.ex	100.00% <100.00%> (ø)
lib/ex_ice/priv/checklist.ex	100.00% <100.00%> (ø)
lib/ex_ice/priv/dns/message.ex	74.54% <ø> (ø)
lib/ex_ice/priv/gatherer.ex	95.12% <100.00%> (ø)
... and 15 more

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