v0.23.0

This release contains a number of fixes for regressions introduced
in 0.22.0, where we shipped a significant refactoring to the way
geckodriver internally dealt with JSON serialisation.

Removed

• The POST /session/{session id}/element/{element id}/tap endpoint
  was removed, thanks to Kerem Kat.

Changed

• webdriver crate upgraded to 0.38.0.

Fixed

• desiredCapabilities and requiredCapabilities are again
  recognised on session creation

  A regression in 0.22.0 caused geckodriver to recognise desired
  and required instead of the correct desiredCapabilities
  and requiredCapabilities. This will have caused significant
  problems for users who relied on this legacy Selenium-style
  session creation pattern.

  Do however note that support for Selenium-styled new session
  requests is temporary and that this will be removed sometime
  before the 1.0 release.

• duration field made optional on pause actions

  A regression in 0.22.0 caused the pause action primitive to
  require a duration field. This has now been fixed so that
  pauses in action chains can be achieved with the default duration.

• Log level formatted to expected Marionette input

  A regression in 0.22.0 caused the log level to be improperly
  formatted when using Firefox pre-releases. This is now fixed so
  that the requested log level is correctly interpreted by Marionette.

• temporary field on addon installation made optional

  A regression in 0.22.0 caused the temporary field for POST
  /session/{session id}/moz/addon/install to be mandatory. This has
  now been fixed so that an addon is installed permanently by default.

• SHA1s in version information uses limited number of characters

  The SHA1 used in --version when building geckodriver from a
  git repository is now limited to 12 characters, as it is when
  building from an hg checkout. This ensures reproducible builds.