set stdin_data to None on non-posix systems

otherwise the elif stdin_data check further down will fail.
With this crash works correctly on windows.
prepare release 0.10.3
add alternative impl using prompt_toolkit
command2: use pygments sql lexer; add multiline support
add stdin and command option support to prompt_toolkit crash version
check for _sql_complete endpoint before enabling auto completion
add connect special cmd; print connect; change tests to use command2
use friendly pygments style
add expanded_mode, \dt and change connect to \connect or \c
add keyword completion; update to latest version; more commands
detect key binding from inputrc
add search and state toolbars