added php 7.4 to travis

oscarotero · oscarotero · commit ca883ff5a228 · 2020-05-28T12:39:03.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -4,6 +4,7 @@ sudo: false
 php:
   - 7.2
   - 7.3
+  - 7.4
 
 before_install:
   - composer install
