bump wasmi version (#8209)

ethcore/wasm/src/lib.rs

@@ -23,7 +23,7 @@ extern crate ethereum_types;
 extern crate libc;
 extern crate parity_wasm;
 extern crate vm;
-extern crate wasm_utils;
+extern crate pwasm_utils as wasm_utils;
 extern crate wasmi;
 
 mod runtime;