Make Guzzle 5 a suggestion not a requirement

README.md

@@ -11,6 +11,8 @@ Quick setup
 0. Install the PHP SDK with [Composer](https://getcomposer.org/)
 
         php composer.phar require launchdarkly/launchdarkly-php
+        php composer.phar require "guzzlehttp/guzzle:5.*"
+        php composer.phar require "guzzlehttp/cache-subscriber:0.1.*"
 
 1. After installing, require Composer's autoloader:
 
@@ -34,6 +36,35 @@ Your first feature flag
             # the code to run if the feature is off
         }
 
+Fetching flags
+--------------
+
+There are two approaches to fetching the flag rules from LaunchDarkly:
+
+* Making HTTP requests (using Guzzle)
+* Setting up the [ld-daemon](https://github.com/launchdarkly/ld-daemon) to store the flags in Redis
+
+Using Guzzle
+============
+
+To use Guzzle it must be required as a dependency:
+
+  php composer.phar require "guzzlehttp/guzzle:5.*"
+  php composer.phar require "guzzlehttp/cache-subscriber:0.1.*"
+
+It will then be used as the default way of fetching flags.
+
+Using Redis
+===========
+
+1. Require Predis as a dependency:
+
+    php composer.phar require "predis/predis:1.0.*"
+
+2. Create the LDClient with the Redis feature requester as an option:
+
+    $client = new LaunchDarkly\LDClient("your_api_key", ['feature_requester_class' => 'LaunchDarkly\LDDFeatureRequester']);
+
 Learn more
 -----------
 

circle.yml

@@ -1,6 +1,6 @@
 machine:
   php:
-    version: 5.4.37
+    version: 5.5.21
 
 test:
   override:

composer.json

@@ -14,17 +14,20 @@
         }
     ],
     "require": {
-        "php": ">=5.4",
-        "guzzlehttp/guzzle": "5.*",
-        "guzzlehttp/cache-subscriber": "0.1.*"
+        "php": ">=5.5"
     },
     "require-dev": {
         "phpunit/phpunit": "4.3.*",
         "phpdocumentor/phpdocumentor": "2.*",
-        "predis/predis": "1.0.*"
+        "predis/predis": "1.0.*",
+        "guzzlehttp/guzzle": "5.*",
+        "guzzlehttp/cache-subscriber": "0.1.*",
+        "zendframework/zend-serializer": "2.7.*"
     },
     "suggested": {
-        "predis/predis": "1.0.*"
+        "predis/predis": "1.0.*",
+        "guzzlehttp/guzzle": "5.*",
+        "guzzlehttp/cache-subscriber": "0.1.*"
     },
     "autoload": {
         "psr-4": {