Update deps

Author: Synchro

composer.json

@@ -22,8 +22,8 @@
         "php": ">=5.3.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "4.3.*",
-        "mikey179/vfsStream": "1.4.*@dev",
+        "phpunit/phpunit": "~4.7",
+        "mikey179/vfsStream": "~1.5",
         "satooshi/php-coveralls": "dev-master",
         "phpunit/phpcov": "dev-master",
         "phpunit/phpunit-story": "*"