rel(1.2.6): Update CHANGES [skip ci]
+1.2.6 (June 09, 2020)
+=====================
+Bug-fix release in the 1.2.x series addressing minor bugs encountered mostly
+within *sMRIPrep*.
+With thanks to Franziskus Liem for contributions.
+
+* FIX: Error conforming T1w images with differing zooms before ``recon-all`` (#534)
+* FIX: Restore and deprecate license argument to ``check_valid_fs_license`` (#538)
+* FIX: Allow anatomical derivatives to have ``run-`` entity (#539)
+
1.2.5 (June 4, 2020)
====================
Bug-fix release that remedies an issue with packaging data
