fs.watch should throw an exception if recursive is not supported

[exx8]

• Version: 12.11
• Platform: Linux Latitude-3500 4.15.0-1056-oem stream.read(0) should not trigger the end event if there is no underlying data #65-Ubuntu SMP Thu Sep 12 20:31:55 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

It has been discussed in the past, that recursion watch is not implementable with good performances in Linux . And it is actually documented, But currently, the fs.watch just ignores this option without signalling the user that the recursive has been ignored. I truly believe that an exception should be thrown if recursive is ignored, as it might cause unexpected bugs while cross-platforming an app or a script, And probably most users wouldn't imagine that such incapability exists, and probably won't look it up.
Of course, this is a breaking change.

[sam-github]

Seems reasonable to me.

[exx8]

Okay, I believe I should wait for more approvals?
Then I'll be more than happy for this to be my first contribution to the project.

[BridgeAR]

@exx8 feel free to open a PR with the necessary changes. Such changes are rarely discussed in depth beforehand and the PR itself should be sufficient.