travis: added PHP 7.3

dg · dg · commit 5ac663056610 · 2018-10-17T18:09:09.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -2,6 +2,7 @@ language: php
 php:
     - 7.1
     - 7.2
+    - 7.3
 
 before_install:
     # turn off XDebug
