Add ICECandidate.to_json and ICECandidate.from_json

[mickel8]

No description provided.

[codecov]

Codecov Report

Merging #62 (7f85ac4) into master (bf45f20) will decrease coverage by 0.50%.
The diff coverage is 0.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #62      +/-   ##
==========================================
- Coverage   88.57%   88.08%   -0.50%     
==========================================
  Files          25       26       +1     
  Lines        1068     1074       +6     
==========================================
  Hits          946      946              
- Misses        122      128       +6     

Files	Coverage Δ
lib/ex_webrtc/ice_candidate.ex	0.00% <0.00%> (ø)

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