Fix SDPUtils.get_dtls_role/1. Handle multiple Group attributes.

[mickel8]

No description provided.

[codecov]

Codecov Report

Merging #82 (7d79110) into master (db45bcd) will increase coverage by 0.02%.
The diff coverage is 83.33%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #82      +/-   ##
==========================================
+ Coverage   88.96%   88.99%   +0.02%     
==========================================
  Files          31       31              
  Lines        1387     1390       +3     
==========================================
+ Hits         1234     1237       +3     
  Misses        153      153              

Files	Coverage Δ
lib/ex_webrtc/sdp_utils.ex	90.40% <83.33%> (+0.23%)	⬆️

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