[nwbio] remove unused import

Author: sprenger

neo/io/nwbio.py

@@ -38,7 +38,7 @@
 # PyNWB imports
 try:
     import pynwb
-    from pynwb import NWBFile, TimeSeries, get_manager
+    from pynwb import NWBFile, TimeSeries
     from pynwb.base import ProcessingModule
     from pynwb.ecephys import ElectricalSeries, Device, EventDetection
     from pynwb.behavior import SpatialSeries