loo v2.10.1

What's Changed

• Revert behavior of internal psis_smooth_tail() function that led to several
  failing tests not caught by CRAN reverse dependency checks. This change should
  not directly affect individual users. by @VisruthSK in #381
• print.compare.loo() regains a simplify argument for showing the full
  comparison table with simplify = FALSE by @florence-bockting in #383.

Full Changelog: v2.10...v2.10.1