Add eslint-plugin-security and pre-commit hooks. (#5)

* feat: add eslint-plugin-security

* chore: relocate devDependencies to the appropriate section in package.json

* feat: add husky library for pre-commit hooks

* feat: add husky library for pre-commit hooks

* chore: improve prettierrc config

.prettierrc.json

@@ -5,5 +5,5 @@
   "tabWidth": 2,
   "useTabs": false,
   "semi": true,
-  "printWidth": 120
-}
+  "printWidth": 80
+}