Add funding icon to README

README.md

 # CodeMirror
 [![Build Status](https://travis-ci.org/codemirror/CodeMirror.svg)](https://travis-ci.org/codemirror/CodeMirror)
-[![NPM version](https://img.shields.io/npm/v/codemirror.svg)](https://www.npmjs.org/package/codemirror)
+[![NPM version](https://img.shields.io/npm/v/codemirror.svg)](https://www.npmjs.org/package/codemirror)  
+[Funding status: ![maintainer happiness](https://marijnhaverbeke.nl/fund/status_s.png)](https://marijnhaverbeke.nl/fund/)
 
 CodeMirror is a JavaScript component that provides a code editor in
 the browser. When a mode is available for the language you are coding

index.html

@@ -104,7 +104,7 @@
     <div class=actionsright>
       Software needs maintenance,<br>
       maintainers need to subsist.<br>
-      Current funding status = <img src="//marijnhaverbeke.nl/fund/status_s.png" title="Current maintainer happiness" style="vertical-align: middle; height: 16px; width: 16px"><br>
+      Current funding status = <img src="https://marijnhaverbeke.nl/fund/status_s.png" title="Current maintainer happiness" style="vertical-align: middle; height: 16px; width: 16px"><br>
       You can help <a href="https://marijnhaverbeke.nl/fund/" title="Set up a monthly contribution">per month</a> or
       <a title="Donate with Paypal" href="javascript:document.getElementById('paypal').submit();">once</a>.
       <form action="https://www.paypal.com/cgi-bin/webscr" method="post" id="paypal">