Docs: add 13 as allowed ecma version (fixes #15159) (#15162)
Docs: add 13 as allowed ecma version (fixes #15159) (#15162)

* Docs: add 13 as allowed ecma version

* Update language-options.md
Trott/eslint,DavidAnson/eslint,Trott/eslint,platinumazure/eslint,platinumazure/eslint,eslint/eslint,eslint/eslint,DavidAnson/eslint