rel(1.3.1): Update CHANGES [skip ci]
+1.3.1 (September 22, 2020)
+==========================
+Bug-fix release in the 1.3.x series.
+Addresses longstanding issues in the anatomical MRI brain extraction workflow.
+
+* FIX: Revision of ``antsBrainExtraction``, better handling edge cases (#567)
+
1.3.0 (September 11, 2020)
==========================
First release in the 1.3.x series.
