feat: expose request options in REST constructor. Fix readme links.

lib/rest-client.js

@@ -4,8 +4,16 @@ const assert = require('assert');
 const RequestWrapper = require('./util/requestWrapper');
 
 module.exports = class RestClient {
-
-  constructor(key, secret, livenet=false, options={}) {
+  /**
+   * @public Creates an instance of the inverse REST API client.
+   *
+   * @param {string} key - your API key
+   * @param {string} secret - your API secret
+   * @param {boolean} [livenet=false]
+   * @param {*} [options={}] options to configure REST API connectivity
+   * @param {*} [requestOptions={}] HTTP networking options for axios
+   */
+  constructor(key, secret, livenet=false, options={}, requestOptions={}) {
     this.request = new RequestWrapper(...arguments);
   }