syntax highlighting in the examples in Readme

Author: aminya

README.md

@@ -120,7 +120,7 @@ In this example, we will implement a `console.log` that we can call from Assembl
 
 Inside of `myWasmFileName.ts`:
 
-```
+```typescript
 declare function consoleLog(message: string): void;
 
 export function myExportedFunctionThatWillCallConsoleLog(): void {
@@ -130,7 +130,7 @@ export function myExportedFunctionThatWillCallConsoleLog(): void {
 
 **JavaScript**
 
-```
+```javascript
 import { AsBind } from "as-bind";
 
 const wasm = fetch("./path-to-my-wasm.wasm");