mhsendmail v0.2.0

#7 - use net/mail to parse mail To header, thanks @zls
#6 - minor bug fixes, thanks @iefbr14
#3, #4 - parse To headers from message body, thanks @t0xicCode

Fixed #5 - runtime error, slice bounds out of range

mhsendmail v0.1.9

Fix #2 - support posix and go flags

mhsendmail v0.1.8

Fix #1 - nil pointer exception

mhsendmail v0.1.7

0.1.7