Change CircleCI PHP version, update tests

Author: jkodumal

circle.yml

@@ -1,6 +1,6 @@
 machine:
   php:
-    version: 5.5.21
+    version: 5.3.29
 
 test:
   override:

tests/FeatureFlagTest.php

@@ -137,8 +137,8 @@ class FeatureFlagTest extends \PHPUnit_Framework_TestCase {
   }";
 
     public function testDecode() {
-        FeatureFlag::decode(\GuzzleHttp\json_decode(FeatureFlagTest::$json1, true));
-        FeatureFlag::decode(\GuzzleHttp\json_decode(FeatureFlagTest::$json2, true));
+        FeatureFlag::decode(json_decode(FeatureFlagTest::$json1, true));
+        FeatureFlag::decode(json_decode(FeatureFlagTest::$json2, true));
     }
 }