Update .travis.yml

.travis.yml

@@ -3,11 +3,10 @@ services:
 before_script:
   - echo "USE mysql;\nUPDATE user SET password=PASSWORD('dev') WHERE user='root';\nFLUSH PRIVILEGES;\n" | mysql -u root
 install:
-  - which phpunit
   - composer require --dev phpunit/phpunit ^5.7
-  - phpunit --version
   - $TRAVIS_BUILD_DIR/vendor/bin/phpunit --version
-  - TRAVIS_BUILD_DIR/phpunit --version
+  - $TRAVIS_BUILD_DIR/phpunit --version
+script: $TRAVIS_BUILD_DIR/vendor/bin/phpunit
 language: php
 php:
   - '7.0'