Add back np for py36.

Signed-off-by: mvashishtha <mahesh@ponder.io>

Author: mvashishtha

modin/pandas/test/test_api.py

@@ -26,6 +26,7 @@ def test_top_level_api_equality():
     extra_in_modin = set(modin_dir) - set(pandas_dir)
     ignore_pandas = [
         "annotations",
+        "np",
         "testing",
         "tests",
         "pandas",