bevy update to 0.18 (#81)

Author: corman44

Cargo.toml

@@ -16,7 +16,7 @@ opt-level = 1
 opt-level = 3
 
 [dependencies]
-bevy = "0.17"
+bevy = "0.18"
 
 # These lints may be important signals about code quality, but normal Bevy code
 # commonly triggers them and the CI workflow treats them as errors, so we've