client: return ErrClientEOS when a playlist ends (#59)

[aler9]

Fixes #59

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (12db622) 71.79% compared to head (61cc8ca) 72.04%.

Files	Patch %	Lines
client_primary_downloader.go	92.85%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #125      +/-   ##
==========================================
+ Coverage   71.79%   72.04%   +0.25%     
==========================================
  Files          43       43              
  Lines        3702     3728      +26     
==========================================
+ Hits         2658     2686      +28     
+ Misses        835      834       -1     
+ Partials      209      208       -1     

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