pr number + enabled pre-commit

Author: eloitanguy

Diff for: RELEASES.md

@@ -7,7 +7,7 @@
 - Added feature `grad=last_step` for `ot.solvers.solve` (PR #693)
 - Automatic PR labeling and release file update check (PR #704)
 - Implement fixed-point solver for OT barycenters with generic cost functions
-  (generalizes `ot.lp.free_support_barycenter`). (PR #???)
+  (generalizes `ot.lp.free_support_barycenter`). (PR #714)
 
 #### Closed issues
 - Fixed `ot.mapping` solvers which depended on deprecated `cvxpy` `ECOS` solver (PR #692, Issue #668)