Fix Travis CI

Author: sangnguyenplus

.travis.yml

@@ -14,7 +14,7 @@ before_script:
 - travis_retry composer update ${COMPOSER_FLAGS} --no-interaction --prefer-source
 
 script:
-- phpunit --coverage-text --coverage-clover=coverage.clover
+- phpunit
 
 after_script:
 - php vendor/bin/ocular code-coverage:upload --format=php-clover coverage.clover

composer.json

@@ -20,7 +20,7 @@
         "laravel/framework": "^5.6|^6.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "^7.0|^8.0",
+        "phpunit/phpunit": "^6.1|^7.0|^8.0",
         "mockery/mockery": "^1.0"
     },
     "autoload": {