chore(deps): update dependency sinon to v6 (#178)

Author: renovate[bot]

core/common/package.json

@@ -93,7 +93,7 @@
     "power-assert": "^1.5.0",
     "proxyquire": "^2.0.1",
     "shimmer": "^1.2.0",
-    "sinon": "^5.1.0",
+    "sinon": "^6.0.0",
     "source-map-support": "^0.5.6",
     "typescript": "~2.9.1",
     "uuid": "^3.2.1"