Add tvOS support

[cemolcay]

Hi, thanks for the great library !
It would be great if you support tvOS.
Adding s.tvos.deployment_target = '9.0' line to podspec is enough.
You need to pod trunk push it with a version bump though.
Thank you :)

[saiday]

@cemolcay
Good to hear your proposal.
I'm worried about I have no time to test it (and I don't have an Apple TV 😓 ), if you can be HysteriaPlayer tvOS maintainer that would be great.

Thank you.