Allow to pass GenServer opts to the PeerConnection

[mickel8]

No description provided.

[codecov]

Codecov Report

Merging #98 (4a75ec4) into master (b6069d9) will not change coverage.
The diff coverage is 100.00%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #98   +/-   ##
=======================================
  Coverage   87.94%   87.94%           
=======================================
  Files          32       32           
  Lines        1576     1576           
=======================================
  Hits         1386     1386           
  Misses        190      190           

Files	Coverage Δ
lib/ex_webrtc/peer_connection.ex	83.83% <100.00%> (ø)

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