fix warning on windows and don't also break unix

fix warning on windows

apply the same test fix as in mio-serial

manually merge changes from #30

Merge pull request #62 from spookyvision/patch-1

Merge pull request #65 from hellow554/master

Merge pull request #70 from ShaneMurphy2/from-tty

Merge branch 'master' into from-tty

Merge pull request #75 from davehorner/master

Merge pull request #76 from peter-cudmore/SerialFramed-export-fix

(fix): made framed module public

nrf console on ttyACM1

fix mut warning on windows/linux.

example: filter_play_sound - example of using cpal and tokio-serial

Allow constructing a SerialStream from a TTYPort