update travis config to fast_finish, test 7.4

Author: michaeldyrynda

.travis.yml

@@ -5,11 +5,14 @@ cache:
     - $HOME/.composer/cache
 
 matrix:
+    fast_finish: true
     include:
         - php: 7.2
           env: ILLUMINATE_VERSION=6.0.*
         - php: 7.3
           env: ILLUMINATE_VERSION=6.0.*
+        - php: 7.4snapshot
+          env: ILLUMINATE_VERSION=6.0.*
 
 before_install: travis_retry composer require "illuminate/database:${ILLUMINATE_VERSION}" "illuminate/events:${ILLUMINATE_VERSION}" --no-update -v