I'd advise you to fixup any forks on GitHub, e.g. https://github.com/fiatjaf/jiq/blob/master/LICENSE, which are currently in breach of license.
You'll need to inform anyone who forked your code, too.
This is something you agreed to in the following part of the license:
> The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
I'd advise you to fixup any forks on GitHub, e.g. https://github.com/fiatjaf/jiq/blob/master/LICENSE, which are currently in breach of license.
You'll need to inform anyone who forked your code, too.
This is something you agreed to in the following part of the license:
> The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.