rel(1.2.4): Update CHANGES [skip ci]
+1.2.4 (June 04, 2020)
+=====================
+Bug-fix release improving the FS license checking
+
+ * ENH: Improve FS license checking (#533)
+
1.2.3 (May 27, 2020)
====================
Bug-fix release addressing some downstream issues in *fMRIPrep*.
