numpy version in py36_locale_slow_old_np on 1.1.x
PR against 1.1.x

not sure if important but numpy version in https://dev.azure.com/pandas-dev/pandas/_build/results?buildId=43144&view=logs&jobId=a69e7846-138e-5465-0656-921e8964615b&j=a69e7846-138e-5465-0656-921e8964615b&t=56da51de-fd5a-5466-5244-b5f65d252624 is 1.19.2

xref #33729
marking as ready for review.

test failure unrelated and numpy 1.15.4 used in py36_locale_slow_old_np and passing LGTM failure unrelated. see https://github.com/pandas-dev/pandas/pull/36396#issuecomment-695195148