Use trusty.

Author: Maikuolan

.travis.yml

@@ -1,15 +1,17 @@
+dist: trusty
+
 language: php
 
 php:
-  - '7.0'
-  - '7.1'
-  - '7.2'
-  - '7.3'
+ - '7.0'
+ - '7.1'
+ - '7.2'
+ - '7.3'
 
 before_script:
-  - phpenv config-rm xdebug.ini || true
+ - phpenv config-rm xdebug.ini || true
 
 script: phpunit .travis.php
 
 notifications:
-  email: false
+ email: false