Merge branch 'v4' into v5

jfcherng · jfcherng · commit 0c27dd39cd38 · 2019-04-29T04:43:24.000+08:00
diff --git a/.travis.yml b/.travis.yml
@@ -4,6 +4,7 @@ php:
   - 7.1
   - 7.2
   - 7.3
+  - 7.4snapshot
 
 cache:
   directories:
