update CHANGES

Author: oesteban

CHANGES

@@ -1,12 +1,17 @@
 Upcoming release 0.13
 =====================
 
+* TST: reduce the size of docker images & use tags for images (https://github.com/nipy/nipype/pull/1564)
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+
 Release 0.12.1 (August 3, 2016)
-==============================
+===============================
+
 * FIX: runtime profiling is optional and off by default (https://github.com/nipy/nipype/pull/1561)
 * TST: circle CI tests run with docker (https://github.com/nipy/nipype/pull/1541)
 * FIX: workflow export functions without import error (https://github.com/nipy/nipype/pull/1552)
 
+
 Release 0.12.0 (July 12, 2016)
 ==============================