chore(deps): update dependency sinon to v8.1.1

Author: renovate-bot

package-lock.json

@@ -63,7 +63,7 @@
     "rollup": "1.29.0",
     "rollup-plugin-babel": "4.3.3",
     "rollup-plugin-uglify": "6.0.4",
-    "sinon": "8.0.4"
+    "sinon": "8.1.1"
   },
   "lint-staged": {
     "test/**/*.js": "eslint",