chore(package): update sinon to version 6.0.0

Author: greenkeeper[bot]

package.json

@@ -73,7 +73,7 @@
     "nyc": "^12.0.1",
     "opn-cli": "^3.1.0",
     "prettier": "^1.12.1",
-    "sinon": "^5.0.3",
+    "sinon": "^6.0.0",
     "standard-version": "^4.4.0",
     "trash-cli": "^1.4.0",
     "tslint": "^5.10.0",