Fix CI

Author: pitbulk

.travis.yml

@@ -1,17 +1,18 @@
 language: php
-
+dist: trusty
 php:
-  - 5.4
+  - 5.5
   - 5.6
   - 7.0
   - 7.1
   - 7.2
-
-env:
- - TRAVIS=true
+  - 7.3
 
 matrix:
   fast_finish: true
+  include:
+    - php: 5.4
+      dist: precise
 
 before_install:
  - composer self-update || true