Update the wat and wast crates (#998)

Now with support for annotations, plus a few minor bug fixes

crates/wast/Cargo.toml

@@ -13,7 +13,7 @@ edition = "2018"
 [dependencies]
 anyhow = "1.0.19"
 wasmtime = { path = "../api", version = "0.9.0" }
-wast = "8.0.0"
+wast = "9.0.0"
 
 [badges]
 maintenance = { status = "actively-developed" }

crates/wast/src/wast.rs

@@ -240,7 +240,7 @@ impl WastContext {
         match directive {
             Module(mut module) => {
                 let binary = module.encode()?;
-                self.module(module.name.map(|s| s.name()), &binary)?;
+                self.module(module.id.map(|s| s.name()), &binary)?;
             }
             Register {
                 span: _,