Merge pull request #9 from unshiftio/greenkeeper/assume-2.0.0

Update assume to the latest version 🚀

Author: 3rd-Eden

package.json

@@ -27,7 +27,7 @@
     "url": "https://github.com/unshiftio/demolish/issues"
   },
   "devDependencies": {
-    "assume": "~1.5.0",
+    "assume": "~2.0.0",
     "istanbul": "0.4.x",
     "mocha": "~3.5.0",
     "pre-commit": "~1.2.0"