update README

Author: jsimpson

README.md

@@ -5,12 +5,13 @@ A Deno module helper class that wraps around [DataView](https://developer.mozill
 ## Usage
 
 ```typescript
-export { BinaryReader } from "https://deno.land/x/binary_reader@v0.1.0/mod.ts";
+import { BinaryReader } from "https://deno.land/x/binary_reader@v0.1.0/mod.ts";
 
 const filename = "some-file.bin";
 const file = Deno.openSync(filename);
 const buffer = Deno.readAllSync(file);
 Deno.close(file.rid);
 
 const binaryReader = new BinaryReader(buffer);
+let data = binaryReader.readUint8();
 ```