chore(deps): update dependency sinon to v7.2.0 (#472)

Author: renovate[bot]

package-lock.json

@@ -119,7 +119,7 @@
     "react-hot-loader": "3.1.3",
     "riteway": "4.0.1",
     "sass-loader": "6.0.7",
-    "sinon": "7.1.1",
+    "sinon": "7.2.0",
     "source-map-loader": "0.2.4",
     "storybook-addon-jsx": "6.0.0",
     "style-loader": "0.23.1",