Update composer.json

mondrake · web-flow · commit ad4ad2099a22 · 2018-01-11T18:17:16.000+01:00
diff --git a/composer.json b/composer.json
@@ -19,6 +19,6 @@
       "bin-dir": "bin"
     },
     "require-dev": {
-        "phpunit/phpunit": "^4.8 || 5.*"
+        "phpunit/phpunit": "^4.8 || 5.* || 6.*"
     }
 }
