Changes for version 2.0 - 2018-10-25
- fix poll and read documentation w.r.t. errors - this changes the documented API, but is how the module has always behaved.
- mention https://lwn.net/Articles/605128/ in the docs.
- new on_overflow callback, called for overflow events.
- new ->broadcast method that calls all watchers with some event.
- automatically broadcast overflow events to all watchers by default.
- read now returns all events (except ignored ones), not just ones it has registered watchers for (e.g. overflow events).
- reduced dependencies (Mike Pomraning).
- add IN_EXCL_UNLINK flag.
- more efficient constant initialisation.
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