Cacher is the code snippet organizer for pro developers

// ==UserScript==
// @name         [GitHub] Add Subscribe on Feedly Button to release page
// @namespace    https://gist.github.com/tkrkt
// @version      1
// @match        https://github.com/*/*/releases
// @grant        none
// ==/UserScript==

var container = document.querySelector('.repository-content .subnav .float-right');
if (container) {
  var a = document.createElement('a');
  a.textContent = 'Subscribe';
  a.className = 'btn btn-sm';
  a.href = 'https://feedly.com/i/discover/sources/search/' + location.href;
  container.appendChild(a);
}