R. Yin

Results 2 issues of R. Yin

**Is your feature request related to a problem? Please describe.** std::io::Stdin implements methods that allow reading one line at a time from Stdin. These methods don't exist on tokio::io::Stdin **Describe...

A-tokio
M-io
C-feature-request
S-waiting-on-author

The current code returns false unconditionally, which is inconsistent with the [Python driver](https://github.com/pimoroni/trackball-python/blob/master/library/trackball/__init__.py#L101-L107). Changed to make it return value