Add AV1 to the list of default video codecs

[mickel8]

see #28 (comment)

[codecov]

Codecov Report

Merging #33 (6110159) into master (2fb14b4) will decrease coverage by 0.18%.
Report is 1 commits behind head on master.
The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #33      +/-   ##
==========================================
- Coverage   84.43%   84.25%   -0.18%     
==========================================
  Files          12       12              
  Lines         559      559              
==========================================
- Hits          472      471       -1     
- Misses         87       88       +1     

Files	Coverage Δ
lib/ex_webrtc/peer_connection/configuration.ex	82.35% <ø> (ø)
lib/ex_webrtc/rtp_codec_parameters.ex	100.00% <ø> (ø)
lib/ex_webrtc/sdp_utils.ex	86.66% <100.00%> (ø)

... and 1 file with indirect coverage changes

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