Updated changelog.

Author: hcpchris

CHANGES.rst

@@ -1,9 +1,8 @@
 
-Release 1.6.0
+Release 1.7.0
 =========================================
 
 * **ENHANCEMENT:** Align the API to **Highcharts (JS) v.11.4** (#163). In particular, this includes:
-
   * Added ``Accessibility.high_contrast_mode`` support.
   * Added ``OrganizationOptions.hanging_side`` support.
   * Added ``SankeyOptions.node_distance`` support.
@@ -12,6 +11,9 @@ Release 1.6.0
     ``SankeyOptions``) ``.node_width`` support and documentation.
   * Added ``NodeOptions.height`` support.
 
+* **ENHANCEMENT:** Added ``utility_functions.datetime64_to_datetime()`` function to convert 
+  ``numpy.datetime64`` to ``datetime.datetime`` (needed to close #162).
+
 --------------------
 
 Release 1.6.0