mpt -> monorepo transition: added missing eslint dependencies

Author: holgerd77

packages/trie/package.json

@@ -59,6 +59,9 @@
     "@types/bn.js": "^4.11.6",
     "@types/tape": "^4.13.0",
     "benchmark": "^2.1.4",
+    "eslint": "^6.8.0",
+    "eslint-config-prettier": "^6.11.0",
+    "eslint-plugin-implicit-dependencies": "^1.0.4",
     "karma": "^5.2.1",
     "karma-chrome-launcher": "^3.1.0",
     "karma-firefox-launcher": "^1.3.0",