add php 7.3

Babichev Maxim · Babichev Maxim · commit ff8d6bc26119 · 2018-11-09T13:17:24.000+03:00
diff --git a/.travis.yml b/.travis.yml
@@ -2,6 +2,7 @@ language: php
 php:
 - '7.1'
 - '7.2'
+- '7.3'
 
 before_script:
 - "composer install"
