added php7.4 to .travis

oscarotero · oscarotero · commit 23ef3eeeec8f · 2020-04-24T18:04:42.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -4,6 +4,7 @@ sudo: false
 php:
   - 7.2
   - 7.3
+  - 7.4
 
 before_script:
   - composer self-update
