Bump version

Fix ranch requirement

Merge pull request gen-smtp#220 from seriyps/enable-test-coverage

Add test coverage to CI; fail if coverage falls below the limit

Roll 0.15

Roll 0.14

Bump version in .app.src

Release 0.11.0

Arjan Scherpenisse (9):
      'rebar3 hex cut' destroyed the .app.src formatting
      Merge pull request gen-smtp#104 from tsloughter/master
      Merge pull request gen-smtp#105 from tsloughter/now_deprecated
      Remove old rebar.test.config
      Merge pull request gen-smtp#71 from fdevibe/master
      Fix gen-smtp#72
      Fix link to OpenACD project
      Merge pull request gen-smtp#106 from zambal/master
      Remove unused nowarn_deprecated_function

Fredrik de Vibe (2):
      Throw permanent_failure when TLS fails due to non-started SSL.
      Close socket and send QUIT also when throwing error because SSL is not started.

Tristan Sloughter (2):
      exclude smtp_rfc822_parse.erl from hex package
      for 18+: remove use of now, replacing with unique_integer

Vincent Siliakus (1):
      Fix -spec's for OTP-19

version bump