test against 7.4 on Travis

Dominik Liebler · Dominik Liebler · commit f2dd278530be · 2019-08-30T07:57:20.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -5,6 +5,7 @@ sudo: false
 php:
   - 7.2
   - 7.3
+  - 7.4snapshot
 
 matrix:
   fast_finish: true
