Update build matrix

Test the same version of PHP we support for cakephp core.

Author: markstory

.travis.yml

@@ -3,14 +3,16 @@ language: php
 sudo: false
 
 php:
-  - 5.5
   - 5.6
   - 7.0
-  - 7.1
+  - 7.2
+  - 7.3
+
+
 
 matrix:
   include:
-    - php: 7.1
+    - php: 7.3
       env: PHPCS=1
 
 before_script: composer install --prefer-dist --dev