Playlist, StreamQuery, and CaptionQuery implement Sequence

[codecov[bot]]

Codecov Report

Merging #52 into master will increase coverage by 0.52%. The diff coverage is 81.81%.

@@            Coverage Diff             @@
##           master      #52      +/-   ##
==========================================
+ Coverage   88.07%   88.59%   +0.52%     
==========================================
  Files          14       14              
  Lines         998     1026      +28     
==========================================
+ Hits          879      909      +30     
+ Misses        119      117       -2

Impacted Files	Coverage Δ
pytube/monostate.py	86.66% <100%> (+2.05%)	:arrow_up:
pytube/contrib/playlist.py	96.9% <100%> (+1.03%)	:arrow_up:
pytube/exceptions.py	100% <100%> (ø)	:arrow_up:
pytube/streams.py	93.49% <100%> (+0.45%)	:arrow_up:
pytube/__main__.py	82.22% <41.66%> (-2.82%)	:arrow_down:
pytube/query.py	99.01% <95%> (+1.06%)	:arrow_up:
pytube/extract.py	95.45% <96.42%> (+4.8%)	:arrow_up:

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[coveralls]

Coverage increased (+0.4%) to 88.825% when pulling e10b0fd10e0f1ac9064b7c88304df0a00ae47211 on sequence-objects into 51df39960291fb6f9ad4e19cc21eef236d445e5f on master.