Add support for removing whitespace for single line imports

[matthew-gerstman]

Hello!

This PR adds support for removing the whitespace from single line imports like so

import {'foo'} from 'bar';

as opposed to

import { 'foo' } from 'bar';

[neilsoult]

@matthew-gerstman FYI I forked this project and incorporated your PR into my release, if you are interested. https://github.com/neilsoult/typescript-imports-sort