chore(release): bump crate version. (#893)

The previous release had not included the update to the Cargo.lock, so
this makes another release to fix that.

Author: zicklag

Cargo.lock

@@ -5,7 +5,7 @@ description = "A tactical 2D shooter"
 edition     = "2021"
 license     = "MIT OR Apache-2.0"
 name        = "jumpy"
-version     = "0.9.3"
+version     = "0.9.4"
 
 [features]
 default = []