This release fixes these two recent issues:

• "Failed to get sync_sequence_id" (#449)
  • Facebook increased the version number requirement for a significant fraction of users (but not everyone, at least not yet)
• "Failed to read fixed header" (#410 for nss, #444 for gnutls)
  • NSS and GnuTLS, the two TLS/SSL libraries that libpurple supports, enabled TLS 1.3 support in recent versions, and so did facebook. There were some incompatibilities with libpurple 2.12.0 (fixed in 2.13.0) and a subtle race condition on our side.
  • Users of versions older than libpurple 2.13.0 who can't upgrade to the latest version might still need to follow the instructions in #410.
  • An error message with this text may still appear for other networking issues that are unrelated (it's a "connection reset by peer" at the beginning of the connection)

And other not so recent issues:

• Fixed crashes immediately after connection errors when glib is built with G_ENABLE_DEBUG or possibly with newer versions of it (#403)
• A handful of deprecation warning fixes and build system improvements by @besser82
• Fix login hang after fetching contact list (#366)