Add collective badges

Author: wooorm

readme.md

@@ -3,6 +3,9 @@
 [![Build][build-badge]][build]
 [![Coverage][coverage-badge]][coverage]
 [![Downloads][downloads-badge]][downloads]
+[![Sponsors][sponsors-badge]][collective]
+[![Backers][backers-badge]][collective]
+[![Chat][chat-badge]][chat]
 [![Size][size-badge]][size]
 
 [**unist**][unist] utility to find nodes after another node.
@@ -108,6 +111,16 @@ abide by its terms.
 
 [size]: https://bundlephobia.com/result?p=unist-util-find-all-after
 
+[sponsors-badge]: https://opencollective.com/unified/sponsors/badge.svg
+
+[backers-badge]: https://opencollective.com/unified/backers/badge.svg
+
+[collective]: https://opencollective.com/unified
+
+[chat-badge]: https://img.shields.io/badge/join%20the%20community-on%20spectrum-7b16ff.svg
+
+[chat]: https://spectrum.chat/unified/syntax-tree
+
 [npm]: https://docs.npmjs.com/cli/install
 
 [license]: license