De-Bump version to 0.3.1

There's no breaking change, no need to bump it that far

Author: david-sawatzke

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "smart-leds-trait"
-version = "0.4.0"
+version = "0.3.1"
 authors = ["David Sawatzke <[email protected]>"]
 edition = "2021"
 categories = [