Revert whitespace change

Change-Id: I34c70b26aa08c43656abf0114bbc3a31b413827d

python/pyarrow/plasma.py

@@ -27,6 +27,7 @@ import time
 from pyarrow._plasma import (ObjectID, ObjectNotAvailable, # noqa
                              PlasmaBuffer, PlasmaClient, connect)
 
+
 # The Plasma TensorFlow Operator needs to be compiled on the end user's
 # machine since the TensorFlow ABI is not stable between versions.
 # The following code checks if the operator is already present. If not,