Updated travis for ES 6.6 and 6.7

Author: ezimuel

.travis.yml

@@ -13,26 +13,18 @@ matrix:
   fast_finish: true
   include:
     - php: 7.0
-      env: ES_VERSION="6.5.0"
+      env: ES_VERSION="6.7.0"
 
     - php: 7.1
-      env: ES_VERSION="6.5.0"
+      env: ES_VERSION="6.7.0"
 
     - php: 7.2
-      env: ES_VERSION="6.5.0"
+      env: ES_VERSION="6.7.0"
 
     - php: 7.3
-      env: ES_VERSION="6.0.0"
+      env: ES_VERSION="6.6.0"
     - php: 7.3
-      env: ES_VERSION="6.1.0"
-    - php: 7.3
-      env: ES_VERSION="6.2.0"
-    - php: 7.3
-      env: ES_VERSION="6.3.0"
-    - php: 7.3
-      env: ES_VERSION="6.4.0"
-    - php: 7.3
-      env: ES_VERSION="6.5.0"
+      env: ES_VERSION="6.7.0"
 
 
 env: