Update history to reflect merge of #6560 [ci skip]

2018-04-30 11:44:50 -04:00 · 2018-04-30 11:44:50 -04:00 · c60dd66db5
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 ### Major Enhancements

  * Remove unused error class (#6511)
+  * Drop support for Ruby 2.1 and 2.2 (#6560)

 ## 3.8.0 / 2018-04-19