🤶 Christmas release! 🎅

This is a patch release with:

• a bug related to Firefox
• a bug if you use data-disable-preview

List of changes:

• Fix medium-editor-insert plugin css fixes on beagle theme #1361
• Update jsDelivr links #1366 & #1367
• Fix Firefox console warning causing issues #1370
• Do not check only for null targets or it will fail when it's undefined. #1373
• Fix crash when 'extensions' in 'isElementDescendantOfExtension' is undefined #1362
• Fix Jasmine Unit Test errors #1385
• Fix null error on pastedPlain.split #1397
• Fix broken browser tests #1396

• Add noopener & noreferrer into targetBlank #1355
• Add undefined check and fallback in Paste extension #1346

Some fixes:

• Add label-checkbox relation in CreateLink form #1275 #1340

Doc / readme / demo:

• Remove src from bower ignored files #1330

New stuff:

• Adding new 'html' button #1291

Some fixes:

• Only add schemes to URLs with hostnames #1258
• Fix problem with addClassToAnchors #1293
• Don't encode fragment as part of linkValidation #1257

Doc / readme / demo:

• Update README + Add simple dev server for running locally #1292
• Updated Readme #1286

Some fixes:

• Efficiency: Compile RegEx once #1230
• Error in console at link selection #1249
• Check for this.anchorPreview when hiding #1280
• Save some CPU calculations #1271

Doc / readme / demo:

• Update WALKTHROUGH docs #1243
• WALKTHROUGH-BUTTON.md: Fix typo #1279
• Demo Page: Adding links to all other demos #1267

• Fix encoded urls (in linkValidaton) #1219
• Fix CommonJS environment #1221

• Add new extensions to extensions README #1188
• Fix iframe div #1179
• Fix placeholder text color in flat theme #1192
• Add unwrapTags option to paste extension #1177
• Remove first empty paragraph on backspace #1187
• Update grunt-contrib-jasmine #1185
• Added Embed Button links to README #1183

• Make linkValidation allow hash links #1143
• Fix toolbar in absolute container #1152
• Fix caret issue in blockquote #1162
• Handle new Google Docs font weights #1168
• Add external button example #1175

• Fix issue with electron environment #1125
• Fix for paste and placeholder extensions & add/remove element events #1124
• Placeholder is visible when only empty table is in Editor #1128

Nothing more than the 5.20.1 😑 (aka bad release)

• Fix test failure in Chrome 51 #1114
• Fix slow CSS selector #1115
• Improve documentation for toolbar.relativeContainer option #1122
• Fix cursor rendering incorrectly in Firefox #1113