Update changelog

Author: eldruin

CHANGELOG.md

@@ -8,20 +8,15 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 ## [Unreleased]
 
 ### Changed
-
 - Use `u8` as default SPI as Serial Word type
+- The Minimum Supported Rust Version (MSRV) is now 1.46.0
 
 ### Added
 - Added `Can` Controller Area Network traits.
 - `Error` traits for SPI, I2C and Serial traits. The error types used in those must
   implement these `Error` traits, which implies providing a conversion to a common
   set of error kinds. Generic drivers using these interfaces can then convert the errors
   to this common set to act upon them.
-- The `NoAcknowledgeAddress` and `NoAcknowledgeData` variants of the I2C `Error`
-  trait have been merged into `NoAcknowledge` with a `NoAcknowledgeSource` field
-  to differentiate between the two events. An additional `Unknown` variant is
-  provided in `NoAcknowledgeSource` for devices that can't differentiate between
-  the two events.
 
 ### Removed
 - Removed `DelayMs` in favor of `DelayUs` with `u32` as type for clarity.