chore: set node engine >= 8.10.0

Author: Anton Konev

package.json

@@ -42,7 +42,7 @@
   ],
   "homepage": "https://github.com/auru/unity-api#readme",
   "engines": {
-    "node": ">=8"
+    "node": ">=8.10.0"
   },
   "dependencies": {
     "isomorphic-fetch": "^2.2.1",