Added PHP 7.3 to Travis.

BluePsyduck · BluePsyduck · commit 90f850bf38b6 · 2019-01-07T17:30:25.000+01:00
diff --git a/.travis.yml b/.travis.yml
@@ -5,6 +5,7 @@ matrix:
   include:
     - php: 7.1
     - php: 7.2
+    - php: 7.3
     - php: nightly
       env: SKIP_COVERAGE=true
   allow_failures:
