fix(node 10): fix compatibility for node v10 🔒🚚📷

- fix security issue by using Buffer.from
- remove negative snapshot test in error.test.js
- change extension wasm file from rust
to reflect file extension of rust (.rs)

Author: DrSensor

src/index.js

@@ -65,5 +65,5 @@ export default function loader(source) {
   setDebugInfo(options.debug || false);
   wasmModule.optimize();
 
-  return Buffer(wasmModule.emitBinary());
+  return Buffer.from(wasmModule.emitBinary());
 }