update CHANGELOG

yob · Jul 14, 2019 · c850d0e · c850d0e
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+UNRELEASED (XXX)
+- Improve utf8 text extraction from CMaps that contain surrogate pair ligatures
+
 v2.2.0 (18th December 2018)
 - Support additional XRef Stream variants (thanks Stefan Wienert)
 - Add frozen_strings pragma to reduce object allocations on ruby 2.3+