add binding address to listen request

[clouds56]

Add listen address option.
The editor auto deleted trailing space.

[eidheim]

Thank you, but you should turn off the option to remove trailing spaces. The commits are impossible to read. Please, if you'd like, you can create a new pull request without the trailing space removal.

[eidheim]

Also, one could have two constructors, one with address, and one without. This way, the library is backwards compatible.