Classes as object props types

[nanot1m]

converts

.myClass {
  ...
}

to

declare const styles: {
  readonly "myClass": string;
};
export = styles;

There is no need in validating keys

[wKich]

Fix #27 and #33

[Quramy]

@nanot1m Thanks for your great contribution and sorry for my late review and reply

I've published your change as v0.4.1, pls check it out 😄