[WIP] feat(pkg-m3u8): Import github.com/grafov/m3u8

[yyoshiki41]

This change is 

[codecov]

Codecov Report

Merging #15 into master will decrease coverage by 15.95%.
The diff coverage is 31.23%.

@@             Coverage Diff             @@
##           master      #15       +/-   ##
===========================================
- Coverage    59.9%   43.94%   -15.96%     
===========================================
  Files          12       14        +2     
  Lines         414      917      +503     
===========================================
+ Hits          248      403      +155     
- Misses        126      446      +320     
- Partials       40       68       +28

Impacted Files	Coverage Δ
timeshift.go	31.81% <ø> (ø)	⬆️
m3u8.go	66.66% <ø> (ø)	⬆️
pkg/m3u8/reader.go	27.8% <27.8%> (ø)
pkg/m3u8/writer.go	48% <48%> (ø)
pkg/m3u8/m3u8.go	66.66% <66.66%> (ø)

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