chore(package): update @types/mocha to version 7.0.1

Closes #119

Author: greenkeeper[bot]

package.json

@@ -61,7 +61,7 @@
     "mobx-collection-store": "^2.0.0"
   },
   "devDependencies": {
-    "@types/mocha": "^5.2.6",
+    "@types/mocha": "^7.0.1",
     "@types/nock": "^11.1.0",
     "@types/node": "^12.0.0",
     "chai": "^4.2.0",