Update changelog; add acknowledgements.

CHANGES.rst

@@ -4,19 +4,28 @@ Changelog
 master
 ------
 
-* Add Config.cli_context() as a hook for custom CLI initialization and cleanup logic (#28; merge of #29).
+* Rewrite imports from _io module to io. (#1, merge of #32). Thanks Radhans
+  Jadhao.
+
+* Add Config.cli_context() as a hook for custom CLI initialization and cleanup
+  logic (#28; merge of #29). Thanks Rodney Folz.
 
 17.12.2
 -------
 
 * Exclude "frozen importlib" functions in default code filter.
-* Fix passing args to script run with ``monkeytype run`` (#18; merge of #21).
-* Fix generated annotations for NewType types (#22; merge of #23).
+
+* Fix passing args to script run with ``monkeytype run`` (#18; merge of
+  #21). Thanks Rodney Folz.
+
+* Fix generated annotations for NewType types (#22; merge of #23). Thanks
+  Rodney Folz.
 
 17.12.1
 -------
 
-* Fix using MonkeyType outside a virtualenv (#16).
+* Fix using MonkeyType outside a virtualenv (#16). Thanks Guido van Rossum for
+  the report.
 
 17.12.0
 -------