Work in Progress

- implements Rooms (resolves #65)
    - [x] scraping
    - iterators/context managers
        - [x] events
        - [x] messages
- implements Users (resolves #52)
    - [x] scraping
- [x] use BeautifulSoup and Requests exclusively in Browser (for #59)
- other bits of previously-discussed friendly interface (resolves #43)
    - [x] `client.get_me()`