fix: polyfill Buffer for browser compatibility (#112)

* Polyfill with "buffer" and "assert" for browser environments
* Instead of relying on webpack to make this library browser compatible, we now use a buffer library that provides a polyfill when used in the browser

packages/ripple-binary-codec/test/binary-parser.test.js

@@ -11,6 +11,7 @@ const { Field, TransactionType } = require("./../dist/enums");
 const { parseHexOnly, hexOnly, loadFixture } = require("./utils");
 const fixtures = loadFixture("data-driven-tests.json");
 const { BytesList } = require("../dist/serdes/binary-serializer");
+const { Buffer } = require("buffer/");
 
 const __ = hexOnly;
 function toJSON(v) {