rel(1.5.2): Update CHANGES [skip ci]
+1.5.2 (March 23, 2022)
+======================
+A bugfix release ensuring compatibility with Python 3.7.
+
+* FIX: Add ``unlink()`` with ``missing_ok`` for Python 3.7 (#695)
+
1.5.1 (March 11, 2022)
======================
A bugfix release addressing several issues and improving the carpet plot.
