Update changelog for ooniprobe 1.2.3-rc1

Changelog

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v1.2.3-rc1 (Wed, 4 Feb 2015)

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* Restructure directories where ooni software writes/reads from

  https://trac.torproject.org/projects/tor/ticket/14086

* Properly set exit codes of oonideckgen

* Exit cleanly if we can't find the probes IP address

* Make the DNS Consistency test handle errors better

v1.2.2 (Fri, 17 Oct 2014)

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