Update .travis.yml (#13)

f3ath · web-flow · commit 45e8ffd1e3c4 · 2020-01-30T23:26:18.000-08:00
diff --git a/.travis.yml b/.travis.yml
@@ -2,7 +2,8 @@ language: php
 php:
   - '7.1'
   - '7.2'
-  - nightly
+  - '7.3'
+  - '7.4'
 
 before_script:
   - composer install
