Merge pull request #5661 from sapics/travis-add-php7.3

Add PHP 7.3 tests on Travis
diff --git a/.travis.yml b/.travis.yml
index 88c7742..2cb2c1f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -9,6 +9,7 @@
   - 7.0
   - 7.1
   - 7.2
+  - 7.3
   - master
   - hhvm
   
@@ -46,6 +47,8 @@
       env: DB=mysql
     - php: 7.2
       env: DB=mysql
+    - php: 7.3
+      env: DB=mysql
     - php: master
       env: DB=mysql