bugfix: l-bfgs-b acq

Author: till-m

bayes_opt/acquisition.py

@@ -300,7 +300,7 @@ def _l_bfgs_b_minimize(
                 continue
 
             # Store it if better than previous minimum(maximum).
-            if min_acq is None or np.squeeze(res.fun) >= min_acq:
+            if min_acq is None or np.squeeze(res.fun) <= min_acq:
                 x_min = res.x
                 min_acq = np.squeeze(res.fun)