- **Breaking** Use `mio-extras` instead of `mio-more` which is not maintained.
- **Breaking** Reexport `mio` rather than selectively re-exporting some of its types.
- Add methods to `Generic` to retrive the inner `Rc` and construct it from an `Rc`
- **Breaking** `LoopHandle::insert_source` now allows to retrieve the source on error.