fix: use babel-eslint to allow Optional Chaining

Author: Eric Ptak

.eslintrc.json

@@ -4,6 +4,8 @@
     "prettier"
   ],
 
+  "parser": "babel-eslint",
+
   "parserOptions": {
     "ecmaVersion": 2018,
     "sourceType": "module"

package-lock.json

@@ -19,13 +19,14 @@
     "superagent": "^4.1.0"
   },
   "devDependencies": {
+    "babel-eslint": "^10.1.0",
     "code": "^5.2.4",
     "dotenv": "^6.2.0",
     "eslint": "^6.8.0",
     "eslint-config-prettier": "^6.10.1",
-    "eslint-plugin-prettier": "^3.1.2",
     "eslint-plugin-import": "^2.16.0",
     "eslint-plugin-mocha": "^5.2.1",
+    "eslint-plugin-prettier": "^3.1.2",
     "mocha": "^7.1.1",
     "nock": "^12.0.2",
     "prettier": "^1.16.4",