docs: Activating Open Collective

* Added backers and sponsors on the README

* Added call to donate after npm install (optional)

README.md

@@ -1,4 +1,6 @@
 # Applause Button
+[![Backers on Open Collective](https://opencollective.com/applause-button/backers/badge.svg)](#backers)
+ [![Sponsors on Open Collective](https://opencollective.com/applause-button/sponsors/badge.svg)](#sponsors) 
 
 A zero-configuration button for adding applause / claps / kudos to web pages and blog-posts.
 
@@ -20,4 +22,34 @@ The applause button is a custom element that can be added directly to the page.
 
 The above will render an applause button, persisting claps and clap counts. 
 
-For more information, visit the [project website](https://colineberhardt.github.io/applause-button/);
+For more information, visit the [project website](https://colineberhardt.github.io/applause-button/);
+
+## Contributors
+
+This project exists thanks to all the people who contribute. 
+<a href="https://github.com/ColinEberhardt/applause-button/graphs/contributors"><img src="https://opencollective.com/applause-button/contributors.svg?width=890&button=false" /></a>
+
+
+## Backers
+
+Thank you to all our backers! 🙏 [[Become a backer](https://opencollective.com/applause-button#backer)]
+
+<a href="https://opencollective.com/applause-button#backers" target="_blank"><img src="https://opencollective.com/applause-button/backers.svg?width=890"></a>
+
+
+## Sponsors
+
+Support this project by becoming a sponsor. Your logo will show up here with a link to your website. [[Become a sponsor](https://opencollective.com/applause-button#sponsor)]
+
+<a href="https://opencollective.com/applause-button/sponsor/0/website" target="_blank"><img src="https://opencollective.com/applause-button/sponsor/0/avatar.svg"></a>
+<a href="https://opencollective.com/applause-button/sponsor/1/website" target="_blank"><img src="https://opencollective.com/applause-button/sponsor/1/avatar.svg"></a>
+<a href="https://opencollective.com/applause-button/sponsor/2/website" target="_blank"><img src="https://opencollective.com/applause-button/sponsor/2/avatar.svg"></a>
+<a href="https://opencollective.com/applause-button/sponsor/3/website" target="_blank"><img src="https://opencollective.com/applause-button/sponsor/3/avatar.svg"></a>
+<a href="https://opencollective.com/applause-button/sponsor/4/website" target="_blank"><img src="https://opencollective.com/applause-button/sponsor/4/avatar.svg"></a>
+<a href="https://opencollective.com/applause-button/sponsor/5/website" target="_blank"><img src="https://opencollective.com/applause-button/sponsor/5/avatar.svg"></a>
+<a href="https://opencollective.com/applause-button/sponsor/6/website" target="_blank"><img src="https://opencollective.com/applause-button/sponsor/6/avatar.svg"></a>
+<a href="https://opencollective.com/applause-button/sponsor/7/website" target="_blank"><img src="https://opencollective.com/applause-button/sponsor/7/avatar.svg"></a>
+<a href="https://opencollective.com/applause-button/sponsor/8/website" target="_blank"><img src="https://opencollective.com/applause-button/sponsor/8/avatar.svg"></a>
+<a href="https://opencollective.com/applause-button/sponsor/9/website" target="_blank"><img src="https://opencollective.com/applause-button/sponsor/9/avatar.svg"></a>
+
+

package.json

@@ -25,13 +25,20 @@
     "build:js": "rollup -c",
     "prepublish": "yarn run build",
     "travis-deploy-once": "travis-deploy-once",
-    "semantic-release": "semantic-release"
+    "semantic-release": "semantic-release",
+    "postinstall": "opencollective-postinstall"
   },
   "dependencies": {
-    "document-register-element": "^1.8.1"
+    "document-register-element": "^1.8.1",
+    "opencollective-postinstall": "^2.0.2",
+    "opencollective": "^1.0.3"
   },
   "repository": {
     "type": "git",
     "url": "https://github.com/ColinEberhardt/applause-button.git"
+  },
+  "collective": {
+    "type": "opencollective",
+    "url": "https://opencollective.com/applause-button"
   }
-}
+}