2.68.alpha - January 7, 2021
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 - Download and validate missing intermediate certificates (requires GnuTLS 3.7) (#96)
 - OpenSSL backend now uses system crypto policy (#106)
 - Remove use of g_assert in testsuite (#137)
 - Restore support for old versions of OpenSSL (#156)
 - Implement TLS channel bindings API (!139, Ruslan Marchenko)
 - Implement PKCS#11 API (!140, Patrick Griffis)
 - Update testsuite for Fedora 33 crypto policy (!141)
 - Fix NULL dereference in g_tls_connection_base_read_message (!144, Vladimir D. Seleznev)
 - Fix a couple code issues found by Coverity