Upgrade youtube_dl to 2019.05.20

[fabaff]

Description:

Changelog: https://github.com/ytdl-org/youtube-dl/releases/tag/2019.05.11

Example entry for configuration.yaml (if applicable):

media_extractor:

Service call:

{  
   "entity_id":"media_player.mpd",
   "media_content_id":"https://www.youtube.com/watch?v=PA_m-ppThPM",
   "media_content_type":"music"
}

Checklist:

• The code change is tested and works locally.
• Local tests pass with tox. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the [development checklist][dev-checklist]

If the code communicates with devices, web services, or third-party tools:

• [The manifest file][manifest-docs] has all fields filled out correctly. Update and include derived files by running python3 -m script.hassfest.
• New or updated dependencies have been added to requirements_all.txt by running python3 -m script.gen_requirements_all.