Update .travis.yml

Author: jasonbahl

.travis.yml

@@ -29,12 +29,6 @@ matrix:
       env: WP_VERSION=latest
     - php: 7.0
       env: WP_VERSION=trunk
-    - php: 5.6
-      env: WP_VERSION=4.9
-    - php: 5.6
-      env: WP_VERSION=latest
-    - php: 5.6
-      env: WP_TRAVISCI=phpcs
   allow_failures:
     - env: WP_TRAVISCI=phpcs
 
@@ -81,4 +75,4 @@ after_success:
       chmod +x php-coveralls.phar
 
       travis_retry php php-coveralls.phar -v
-    fi
+    fi