Update readme

Author: ericingram

README.md

@@ -1,6 +1,6 @@
 ## Schema API Client for NodeJS [![Build Status](https://travis-ci.org/schemaio/schema-node-client.png?branch=master)](https://travis-ci.org/schemaio/schema-node-client)
 
-Build and scale ecommerce with Schema. Create a free account at <https://schema.io>
+Build and scale ecommerce with Schema. Create your account at <https://schema.io>
 
 ## Install
 
@@ -9,30 +9,30 @@ Build and scale ecommerce with Schema. Create a free account at <https://schema.
 ## Connect
 
 ```javascript
-var Schema = require('schema-client');
+const Schema = require('schema-client');
 
-var client = new Schema.Client('<client-id>', '<client-key>');
+const client = new Schema.Client('<client-id>', '<client-key>');
 ```
 
 ## Usage
 
 ```javascript
-client.get('/products', {active: true}, function(err, products) {
-  if (err) {
-    // handle error
-    return;
-  }
+client.get('/products', { active: true }).then(products => {
   console.log(products);
+}).catch(err => {
+  // handle error
 });
 ```
 
-#### With promises
+## Caching
+
+As of v3, this client provides in-memory caching enabled by default. It uses a version clocking protocol that means you never have to worry about stale cache, and collections that don't change frequently, such as products, will always return from cache when possible.
+
+To disable caching behavior, initialize the client with `cache: false`.
 
 ```javascript
-client.get('/products', {active: true}).then(function(products) {
-  console.log(products);
-}).catch(function(err) {
-  // handle error
+new Schema.Client('<client-id>', '<client-key>', {
+  cache: false,
 });
 ```
 
@@ -47,4 +47,3 @@ Pull requests are welcome
 ## License
 
 MIT
-