Updated CHANGELOG for 0.12.2 release

CHANGELOG.md

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+# Release 0.12.1 (2016-09-13)
+
+## Fixed
+- #599: In some cases was not importing dependencies config
+- #601: Fixed issue where --all-dependencies flag stopped working
+
 # Release 0.12.1 (2016-08-31)
 
 ## Fixed