docs(readme): add Node version badge

Author: jrolfs

README.md

@@ -11,6 +11,7 @@
 [![Code Coverage][coverage-badge]][coverage-link]
 [![Version][package-badge]][package-link]
 [![Maintenance][maintenance-badge]][maintenance-link]
+[![Node Version][node-badge]][node-link]
 [![MIT License][license-badge]][license-link]
 [![Code Style][prettier-badge]][prettier-link]
 [![Conventional Commits][conventional-commits-badge]][conventional-commits-link]
@@ -138,16 +139,18 @@ MIT
 [conventional-commits-badge]:
   https://img.shields.io/badge/Conventional%20Commits-1.0.0-yellow.svg
 [conventional-commits-link]: https://conventionalcommits.org
+[coverage-link]: https://codecov.io/github/hoverinc/hover-javascript
 [coverage-badge]:
   https://img.shields.io/codecov/c/github/hoverinc/hover-javascript.svg
 [maintenance-badge]:
   https://img.shields.io/badge/maintenance-active-247ddc?logo=data:image/png;base64,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
 [maintenance-link]: https://github.com/hoverinc/hover-javascript#maintenance
-[coverage-link]: https://codecov.io/github/hoverinc/hover-javascript
 [license-badge]: https://img.shields.io/npm/l/@hover/javascript.svg
 [license-link]: https://github.com/hoverinc/hover-javascript/blob/master/LICENSE
-[package-badge]: https://img.shields.io/npm/v/@hover/javascript.svg
-[package-link]: https://www.npmjs.com/package/@hover/javascript
+[node-link]: https://nodejs.org/en/download/
+[node-badge]: https://img.shields.io/badge/node-v12.18.4-green
 [prettier-badge]:
   https://img.shields.io/badge/code_style-prettier-ff69b4.svg?logo=prettier
 [prettier-link]: https://prettierjs.org/en/download/
+[package-badge]: https://img.shields.io/npm/v/@hover/javascript.svg
+[package-link]: https://www.npmjs.com/package/@hover/javascript