update CHANGELOG

allourideas · Nov 16, 2017 · 6f6237a · 6f6237a
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+ * Drop support for Ruby 1.8.7.
+ * Add tau and alpha as parameters to catchup algorithm.
+ * Record which algorithm was used to select a prompt.
  * Add similar choice method to find similar (currently only identical) choices.
  * Retry transaction when creating appearance if get deadlocked.