5.0.3

:release-date: 2021-01-19 9:00 P.M UTC+6:00
:release-by: Asif Saif Uddin

• Change the default value of ssl_version to None. When not set, the
  proper value between ssl.PROTOCOL_TLS_CLIENT and ssl.PROTOCOL_TLS_SERVER
  will be selected based on the param server_side in order to create
  a TLS Context object with better defaults that fit the desired
  connection side.

• Change the default value of cert_reqs to None. The default value
  of ctx.verify_mode is ssl.CERT_NONE, but when ssl.PROTOCOL_TLS_CLIENT
  is used, ctx.verify_mode defaults to ssl.CERT_REQUIRED.

• Fix context.check_hostname logic. Checking the hostname depends on
  having support of the SNI TLS extension and being provided with a
  server_hostname value. Another important thing to mention is that
  enabling hostname checking automatically sets verify_mode from
  ssl.CERT_NONE to ssl.CERT_REQUIRED in the stdlib ssl and it cannot
  be set back to ssl.CERT_NONE as long as hostname checking is enabled.

• Refactor the SNI tests to test one thing at a time and removing some
  tests that were being repeated over and over.