methods for other built-in numeric types.
* `EnumSet::bit_width` and `EnumSet::variant_count` now return a `u32` instead
of a `u8` for future-proofing.
+* Removed `nightly` feature flag, as it is no longer required.
# Version 0.4.5 (2020-02-19)
* Fixed a bug where compilation failed when the `serde` flag was enabled, and