move Future.copy! to Base (fix #29173)#29178

Merged

JeffBezanson merged 3 commits intomasterfrom rf/copybang-to-base

Oct 20, 2018

+66-64

Commits on Sep 14, 2018

Commits on Sep 16, 2018

call the Base methods (KristofferC) and update docstring
rfourquet
committed