v6.86

This release fixes the following CRITICAL SECURITY FIXES:

• Security fix to InvisibleBleed in WeKan. Escape HTML comment tags so that HTML comments are visible.
  Thanks to xet7 for fixing.
• Security Fix to AdminBleed in WeKan, so that non-admin can not change to Admin.
  Thanks to Christian Pöschl of usd AG Responsible Disclosure Team for reporting and xet7 for fixing.

and adds the following new features:

• Feature: Show plus sign in front of attachments.
  Thanks to Meeques and xet7.

and adds the following updates:

• Upgrade to Meteor 2.12-beta.2.
  Thanks to Meteor developers.
• Update Docker Ubuntu base image and Meteor version.
  Thanks to xet7.

and fixes the following bugs:

• Fix Exception in callback of async function: TypeError: this._now is not a function.
  Part 1,
  Part 2.
  Thanks to xet7.
• Remove extra debug message and disable some rarely used feature that produces errors.
  Thanks to xet7.
• Revert some migration filename changes.
  Thanks to xet7.
• Add back node-gyp related dependencies.
  Thanks to xet7.

Thanks to above GitHub users for their contributions and translators for their translations.