* Replace mutable "allowed_hosts" argument of starlette.middleware.trustedhost.TrustedHostMiddleware with None.
* Add unit test to cover case when TrustedHostMiddleware.allowed_hosts is None
* Fix style issues
* Code style fixes
* Fix unit tests for TrustedHostMiddleware
* Support domain wildcards with TrustedHostMiddleware
* Support domain wildcards with TrustedHostMiddleware
* Include domain wildcards in TrustedHostMiddleware docs