got imorts working

src/main.rs

@@ -82,9 +82,11 @@ fn main() {
    // Load wasm binary and prepare it for instantiation.
    let module = wasmi::Module::from_buffer(&wasm_binary).expect("failed to load wasm");
 
+   let imports = ImportsBuilder::new().with_resolver("host", &HostFunctions);
+
    // Instantiate a module with empty imports and
    // assert that there is no `start` function.
-    let instance = ModuleInstance::new(&module, &ImportsBuilder::default())
+   let instance = ModuleInstance::new(&module, &imports)
       .expect("failed to instantiate wasm module")
       .assert_no_start();