Update dependencies, remove unused dependencies, add prettier plugin to eslint (#19)

Author: carlzogh

.eslintrc

@@ -3,13 +3,12 @@
   "parserOptions": {
     "project": ["src/tsconfig.json", "test/unit/tsconfig.json"]
   },
-  "plugins": ["@typescript-eslint"],
+  "plugins": ["@typescript-eslint", "prettier"],
   "extends": [
     "eslint:recommended",
     "plugin:@typescript-eslint/eslint-recommended",
     "plugin:@typescript-eslint/recommended",
-    "prettier",
-    "prettier/@typescript-eslint"
+    "prettier"
   ],
   "env": {
     "node": true,