Update code block to use JavaScript syntax highlighting rather than T…

…ypeScript

README.md

@@ -9,7 +9,7 @@ Web3 ProviderEngine is a tool for composing your own [web3 providers](https://gi
 >
 >Here is an example of how to create a provider using those packages:
 >
-> ```typescript
+> ```javascript
 >import { providerFromMiddleware } from '@metamask/eth-json-rpc-provider';
 >import { createFetchMiddleware } from '@metamask/eth-json-rpc-middleware';
 >