prepare 5.3.1 release (#115)

CHANGELOG.md

@@ -2,6 +2,10 @@
 
 All notable changes to the LaunchDarkly Node.js SDK will be documented in this file. This project adheres to [Semantic Versioning](http://semver.org).
 
+## [5.3.1] - 2018-08-27
+### Fixed:
+- Calling `allFlagsState()` did not work if you omitted the optional second parameter, `options`, but did provide a `callback`. ([#114](https://github.com/launchdarkly/node-client/issues/114))
+
 ## [5.3.0] - 2018-08-27
 ### Added:
 - The new `LDClient` method `allFlagsState()` should be used instead of `allFlags()` if you are passing flag data to the front end for use with the JavaScript SDK. It preserves some flag metadata that the front end requires in order to send analytics events correctly. Versions 2.5.0 and above of the JavaScript SDK are able to use this metadata, but the output of `allFlagsState()` will still work with older versions.

index.js

@@ -242,7 +242,12 @@ var newClient = function(sdkKey, config) {
   }
 
   client.allFlagsState = function(user, options, callback) {
-    options = options || {};
+    if (callback === undefined && typeof(options) === 'function') {
+      callback = options;
+      options = {};
+    } else {
+      options = options || {};
+    }
     return wrapPromiseCallback(new Promise(function(resolve, reject) {
       sanitizeUser(user);