Update .travis.yml

mcfedr · ondrejmirtes · commit fdff97e4ce23 · 2019-02-13T13:49:43.000+01:00
diff --git a/.travis.yml b/.travis.yml
@@ -2,6 +2,7 @@ language: php
 php:
   - 7.1
   - 7.2
+  - 7.3
 before_script:
   - composer self-update
   - composer install
