[glib-networking] Created tag 2.59.2

[Michael Catanzaro <mcatanzaro src gnome org>]

The unsigned tag '2.59.2' was created.

Tagger: Michael Catanzaro <mcatanzaro igalia com>
Date: 1546892710 -0600

    glib-networking 2.59.2

Changes since the last tag '2.59.1':

Michael Catanzaro (6):
      Turn GTlsBackendGnutls into a final class
      Turn GTlsCertificateGnutls into a final class
      Fix style and parameter type in a callback
      Don't use the slice allocator
      Update all GLIB_CHECK_VERSION usage
      Prepare 2.59.2

Scott Hutton (1):
      Implement ALPN support

Xavier Claessens (2):
      ci: Add Dockerfile
      Fix gio_module_dir with some wrong gio-2.0.pc