Docs: fix typo

Author: strager

plugin/vim/quick-lint-js.vim/doc/quick-lint-js.txt

@@ -8,7 +8,7 @@ This file contains instructions for installing and using the quick-lint-js
 plugin.
 
 This plugin version is designed for quick-lint-js version 0.5.0. Older or
-newer version might or might not work.
+newer versions might or might not work.
 
 1. Installing quick-lint-js	|quick-lint-js-app-install|
 2. Installing the plugin	|quick-lint-js-vim-install|