v3.1.2

Version 3.1.2

 - Documentation around "Illegal Instruction" errors
 - Resolve some ambiguities around publishing that was causing some issues on some versions and platforms of npm and node
 - [linux] bug fix in `.list()` where we weren't filtering out non block devices that are named like serial ports
 - [unix] Better unix error messages
 - [unix] Refactor `setBaudrate` for Unix making it easier for custom baudRate support
 - [unix] Update now has less memory leaks, documentation and better error messages
 - [windows] Better error messages for opening ports