[TEST] Update travis matrix

 Add 2.2, remove 1.5

Author: polyfractal

.travis.yml

@@ -16,21 +16,21 @@ php:
 matrix:
   fast_finish: true
   include:
+    - php: 5.6
+      env: ES_VERSION="2.1" TEST_BUILD_REF="origin/2.1"
     - php: 5.6
       env: ES_VERSION="2.0" TEST_BUILD_REF="origin/2.0"
     - php: 5.6
       env: ES_VERSION="1.7" TEST_BUILD_REF="origin/1.7"
     - php: 5.6
       env: ES_VERSION="1.6" TEST_BUILD_REF="origin/1.6"
-    - php: 5.6
-      env: ES_VERSION="1.5" TEST_BUILD_REF="origin/1.5"
   allow_failures:
     - php: hhvm
 
 env:
   global:
-    - ES_VERSION="2.1"
-    - TEST_BUILD_REF="origin/2.1"
+    - ES_VERSION="2.2"
+    - TEST_BUILD_REF="origin/2.2"
     - ES_TEST_HOST=http://localhost:9200
 
 before_install: