actually add eslint

package.json

@@ -6,7 +6,10 @@
   "license": "MIT",
   "repository": "https://github.com/espruino/BangleApps",
   "devDependencies": {
-    "eslint": "7.1.0"
+    "eslint": "^8.14.0",
+    "eslint-config-airbnb-base": "^15.0.0",
+    "eslint-plugin-import": "^2.26.0",
+    "npm-watch": "^0.11.0"
   },
   "scripts": {
     "lint-apps": "eslint ./apps --ext .js",
@@ -20,8 +23,5 @@
   },
   "dependencies": {
     "acorn": "^7.2.0"
-  },
-  "devDpendencies": {
-    "npm-watch": "^0.11.0"
   }
 }