chore: add eslint deps and lint script

Author: jamesgeorge007

Diff for: package-lock.json

@@ -22,6 +22,7 @@
     "docsify": "bin/docsify"
   },
   "scripts": {
+    "lint": "eslint .",
     "test": "ava e2e/index.js",
     "release": "standard-version",
     "prebuild": "rimraf bin",
@@ -53,7 +54,8 @@
   "devDependencies": {
     "ava": "^2.4.0",
     "cors": "^2.8.1",
-    "eslint": "^6.5.1",
+    "eslint": "^6.8.0",
+    "eslint-config-xo-space": "^0.22.0",
     "execa": "^4.0.0",
     "rimraf": "^3.0.0",
     "rollup": "^1.27.13",