Update .travis.yml

Author: GrahamCampbell

.travis.yml

@@ -1,6 +1,10 @@
 language: php
+
 php: [ 7.1, 7.2, 7.3, 7.4 ]
 
+matrix:
+  fast_finish: true
+
 install:
   - travis_retry composer install --no-interaction --prefer-dist --optimize-autoloader