Correct export of Node classes (#51)

Closes #47

Author: TitanNano

Cargo.lock

@@ -14,7 +14,7 @@ godot = { git = "https://github.com/godot-rust/gdext", tag = "v0.1.3", features
 godot-cell = { git = "https://github.com/godot-rust/gdext", tag = "v0.1.3" }
 itertools = "0.10.3"
 rand = "0.8.5"
-darling = { version = "0.20.3" }
+darling = { version = "0.20.10" }
 proc-macro2 = "1.0.68"
 quote = "1.0.33"
 syn = "2.0.38"