Test against PHP 7.3 on travis

WyriHaximus · WyriHaximus · commit 4302b6bc738a · 2018-10-26T17:28:52.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -9,6 +9,7 @@ php:
 # - 7.0 # Mac OS X test setup, ignore errors, see below
   - 7.1
   - 7.2
+  - 7.3
   - nightly # ignore errors, see below
   - hhvm # ignore errors, see below
 
