Add tooltip (#15)

Author: ArnaudLigny

package.json

@@ -1,6 +1,6 @@
 {
   "name": "Edit-in-Prose",
-  "version": "1.1.2",
+  "version": "1.2.0",
   "description": "Provides an \"Edit in Prose\" link from a hosted file on GitHub.",
   "homepage": "https://github.com/prose/browser-extensions/",
   "license": "BSD-3-Clause",

src/manifest.json

@@ -1,7 +1,7 @@
 {
   "name": "Edit in Prose",
   "description": "Provides an \"Edit in Prose\" link from a hosted file on GitHub.",
-  "version": "1.1.2",
+  "version": "1.2.0",
   "manifest_version": 2,
   "author": "Tristen Brown",
   "homepage_url": "http://prose.io",

src/prose.js

@@ -35,8 +35,9 @@
       const link = document.createElement('a');
       link.id = 'prose';
       link.innerHTML = '<span class="prose-icon"></span>Edit in Prose';
-      link.className = 'btn btn-sm BtnGroup-item';
+      link.className = 'btn btn-sm BtnGroup-item tooltipped tooltipped-n rgh-md-source';
       link.rel = 'nofollow';
+      link.setAttribute('aria-label', 'Open file in Prose.io');
       a = link.firstChild;
       group.insertBefore(link, group.firstChild);
     }