Merge pull request #24 from rustadopt/dependabot/cargo/serial_test-tw-3.1

Update serial_test requirement from ^2.0 to ^3.1

Author: gierens

Cargo.toml

@@ -33,4 +33,4 @@ default-features = false
 features = []
 
 [dev-dependencies.serial_test]
-version = "^2.0"
+version = "^3.1"