Merge pull request #8 from asbiin/update-phpunit-7.0

Bump phpunit to 7.0

Author: matthiasnoback

composer.json

@@ -3,8 +3,8 @@
   "require": {
     "php": "^5.6 || ^7.0",
     "webmozart/assert": "^1.2",
-    "phpunit/php-code-coverage": "^4.0 || ^5.2",
-    "phpunit/phpunit": "^5.7 || ^6.0"
+    "phpunit/php-code-coverage": "^4.0 || ^5.2 || ^6.0",
+    "phpunit/phpunit": "^5.7 || ^6.0 || ^7.0"
   },
   "autoload": {
     "psr-4": {