v0.4.0

CHANGES:

• Be resilient when we parse a replies (#27, @dinosaure, review by @mikonieminen)

• breaking changes
  Rename sendmail.tls to sendmail.starttls
  Rename Sendmail_with_tls to Sendmail_with_starttls
  (#28, @dinosaure, issue #25)

• Handle dot special character when we transmit the mail
  (#30, @dinosaure, review by @mikonieminen, @Jerben and @Julow, issue #29)

  sendmail already expects a stream which emits line per line the mail
  but it sanitizes now the dot character according the SMTP protocol. If
  the user uses mrmime to generate the mail, he should upgrade it to
  mrmime.0.3.2. Otherwise, it must respect this assumption.