Mp4MuxingList should return Mp4Muxing

[namor]

encoder.muxing.mp4.build erroneously returns a TsMuxing instance.
This should return a Mp4Muxing instance

[codecov]

Codecov Report

Merging #4 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master       #4   +/-   ##
=======================================
  Coverage   98.79%   98.79%           
=======================================
  Files          95       95           
  Lines        1825     1825           
=======================================
  Hits         1803     1803           
  Misses         22       22

Impacted Files	Coverage Δ
...ovin/encoding/encodings/muxings/mp4_muxing_list.rb	100% <100%> (ø)	⬆️

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[Tigraine]

Awesome thanks!

[namor]

@Tigraine could I request that you rebase master into the #3 branch? Using that branch for my app

[Tigraine]

@namor Done. I merged develop into #3