added info about composite transforms

Author: chrisgorgo

CHANGES

@@ -1,6 +1,7 @@
 Next release
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+* FIX: ants.Registration composite transform outputs are no longer returned as lists (https://github.com/nipy/nipype/pull/1183)
 * FIX: Bug in XFibres5 (https://github.com/nipy/nipype/pull/1168)
 * ENH: Attempt to use hard links for data sink.
     (https://github.com/nipy/nipype/pull/1161)