Filter out streams with mismatched content length

[Tyrrrz]

Closes #759

[codecov]

Codecov Report

Attention: 13 lines in your changes are missing coverage. Please review.

Comparison is base (49ce828) 76.15% compared to head (174bad0) 76.48%.

Files	Patch %	Lines
YoutubeExplode/Videos/Streams/StreamClient.cs	78.84%	8 Missing and 3 partials ⚠️
YoutubeExplode/Videos/Streams/MediaStream.cs	75.00%	1 Missing ⚠️
YoutubeExplode/YoutubeHttpHandler.cs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #760      +/-   ##
==========================================
+ Coverage   76.15%   76.48%   +0.32%     
==========================================
  Files          99       99              
  Lines        3259     3266       +7     
  Branches      479      478       -1     
==========================================
+ Hits         2482     2498      +16     
+ Misses        553      546       -7     
+ Partials      224      222       -2     

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