Update change log

rasterio · Jun 4, 2018 · b125a63 · b125a63
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commit b125a63
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diff --git a/CHANGES.txt b/CHANGES.txt
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 CHANGES
 =======
 
+2.2.1 (2018-06-04)
+------------------
+- Docstring improvements (#37).
+
 2.2.0 (2018-03-20)
 ------------------
 - Addition of permutation matrix (#35).