Update .travis.yml

Author: santigarcor

.travis.yml

@@ -13,9 +13,9 @@ env:
 matrix:
   fast_finish: true
   include:
-    - php: 7.0
-      env: setup=lowest
     - php: 7.1
+      env: setup=lowest
+    - php: 7.4
       env: setup=stable
 
 sudo: false