Merge branch 'master' into glitch-soc/merge-upstream

Conflicts:
- README.md
  Kept our version
- app/javascript/mastodon/features/compose/components/compose_form.js
  Two changes too close to each other, took both changes

jest.config.js

@@ -23,4 +23,8 @@ module.exports = {
     '!app/javascript/mastodon/test_setup.js',
   ],
   coverageDirectory: '<rootDir>/coverage',
+  moduleDirectories: [
+    '<rootDir>/node_modules',
+    '<rootDir>/app/javascript',
+  ],
 };