Possible memory leakage in the `Script` struct

[rikkaii]

Hi, I notice that in the following code, the raw pointerraw_script is allocated in Script::parse but never freed, which could potentially cause a memory leak.

wabt-rs/src/lib.rs

Lines 656 to 660 in 14f82c5

	struct Script {
	raw_script: *mut ffi::Script,
	lexer: Lexer,
	features: Features,
	}