Release 0.14.0

0.14.0

• Add SM-state serialization mechanism (#239)
• Add support for SCRAM-SHA-512-PLUS (da12298)
• Add support for SSLKEYLOGFILE with OpenSSL (d82df12)
• Fix some issues related to Stream Management (03d4313, 4359536)
• Fix a potential segfault (9fef4b7)
• New API:
  • xmpp_conn_set_sm_callback()
  • xmpp_conn_restore_sm_state()