Remove NILICENSE for gRPC Features (#716)

* Delete NILICENSE

* Remove NILICENSE from README.rst

Author: zhindes

NILICENSE

@@ -387,8 +387,3 @@ License
 `LICENSE <https://github.com/ni/nidaqmx-python/blob/master/LICENSE>`_).
 Other incorporated projects may be licensed under different licenses. All
 licenses allow for non-commercial and commercial use.
-
-**gRPC Features**
-For driver APIs that support it, passing a GrpcSessionOptions instance as a
-parameter is subject to the NI General Purpose EULA
-(`see NILICENSE <https://github.com/ni/nidaqmx-python/blob/master/NILICENSE>`_).