Merge pull request seanmiddleditch#45 from seanmiddleditch/develop

Release 0.23

Merge pull request seanmiddleditch#40 from seanmiddleditch/release/0.22

Release 0.22

prepare for 0.21 release

make 0.20 release

add NEWS note about telnet_raw_printf()

silence another goofy warning

Merge branch 'master' of github.com:elanthis/libtelnet

Merge branch '0.9'