Enable yaml feature in rbx_xml

Author: Dekkonot

rbx_xml/Cargo.toml

@@ -21,4 +21,4 @@ xml-rs = "0.8.4"
 
 [dev-dependencies]
 env_logger = "0.9.0"
-insta = "1.14.1"
+insta = { version = "1.14.1", features = ["yaml"] }