feat(eslint): Rule "arrow-parens"

Signed-off-by: Valentin Popov <info@valentineus.link>

ROADMAP.md

@@ -8,7 +8,7 @@
 - [ ] "array-callback-return"
 - [ ] "array-element-newline"
 - [ ] "arrow-body-style"
-- [ ] "arrow-parens"
+- [X] "arrow-parens"
 - [ ] "arrow-spacing"
 - [ ] "block-scoped-var"
 - [ ] "block-spacing"

src/rules/eslint.json

@@ -1,4 +1,8 @@
 {
+  "arrow-parens": [
+    "error",
+    "always"
+  ],
   "brace-style": [
     "error",
     "1tbs",