bump version to 0.17.2

Author: mrocklin

docs/source/changelog.rst

@@ -8,9 +8,34 @@ Changelog
 Array
 +++++
 
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+DataFrame
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+-
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+Bag
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+Core
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+0.17.2 / 2018-03-21
+-------------------
+
+Array
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+
 - Add `broadcast_arrays` for Dask Arrays (:pr:`3217`) `John A Kirkham`_
 - Add `bitwise_*` ufuncs (:pr:`3219`) `John A Kirkham`_
 - Validate inputs to atop (:pr:`3307`) `Matthew Rocklin`_
+- Avoid calls to astype in concatenate if all parts have the same dtype (:pr:`3301`) `Martin Durant`_
 
 DataFrame
 +++++++++