Update .travis.yml

Author: barryvdh

.travis.yml

@@ -1,8 +1,6 @@
 language: php
 
 php:
-  - 5.6
-  - 7.0
   - 7.1
   - 7.2
 
@@ -22,9 +20,9 @@ env:
 
 matrix:
   include:
-    - php: 5.6
+    - php: 7,1
       env: setup=lowest symfony="^2.1"
-    - php: 5.6
+    - php: 7.1
     - env: setup=lowest symfony="^3"
     - php: 7.1
       env: setup=lowest symfony="^4"