Changed PhpUnit call to vendor directory in Travis script

Author: shudd3r

.travis.yml

@@ -24,10 +24,10 @@ before_script:
 
         composer style-check src $CHANGED_FILES;
         composer style-check tests $CHANGED_FILES;
-        phpunit --no-coverage;
+        php vendor/bin/phpunit --no-coverage;
       else
         mkdir -p build/logs;
-        phpunit;
+        php vendor/bin/phpunit;
       fi;
     }
   - composer update $STABILITY