php version changes.

Author: fletch3555

Diff for: .travis.yml

@@ -1,10 +1,9 @@
 language: php
 sudo: false
 php:
-    - 5.4
-    - 5.5
-    - 5.6
-    - 7.0
-    - hhvm
+    - 7.1
+    - 7.2
+    - 7.3
+    - 7.4
 before_install: "composer install"
 script: "vendor/bin/phpunit"