Prepare changelog for 0.5

Author: SludgePhD

CHANGELOG.md

@@ -1,5 +1,24 @@
 # Changelog
 
+## v0.5.0
+
+### Breaking Changes
+
+- `EffectKind` no longer implements `Eq`.
+- `Effect::kind()` now returns `EffectKind` instead of `Option<EffectKind>`.
+- `UnknownVariant` error type is now called `ParseVariantError`.
+  - The `From<UnknownVariant> for io::Error` implementation has been removed.
+- `Effect::direction()` now uses a `Direction` wrapper type.
+- The `log` functionality is now hidden behind a `"log"` Cargo feature (enabled by default).
+- `Evdev::set_X_mask` now accepts an `impl IntoIterator` argument rather than a `&BitSet<V>`.
+- `EventKind::Other` has been renamed and hidden, and no longer part of the public API.
+- Previously deprecated APIs have been removed.
+
+### Other Changes
+
+- `Condition`-based force-feedback effects (`Spring`, `Friction`, …) now have explicit constructors
+  in addition to the `From` implementations.
+
 ## v0.4.6
 
 ### Fixes