chore(package): update sinon to version 7.3.2

Closes #84

Author: greenkeeper[bot]

package.json

@@ -149,7 +149,7 @@
     "enzyme-adapter-react-16": "^1.0.0",
     "redux-logger": "^3.0.6",
     "sass-loader": "^6.0.6",
-    "sinon": "^4.0.0",
+    "sinon": "^7.3.2",
     "spectron": "^3.4.1",
     "style-loader": "^0.19.0",
     "ts-loader": "^3.1.0",