Fixed TREZOR plugin to work with python-trezor>=0.7.0 (to be released).

plugins/trezor/trezor.py

@@ -15,8 +15,7 @@ class TrezorPlugin(TrezorCompatiblePlugin):
         from .client import TrezorClient as client_class
         import trezorlib.ckd_public as ckd_public
         from trezorlib.client import types
-        from trezorlib.transport_hid import HidTransport, DEVICE_IDS
-        from trezorlib.transport_bridge import BridgeTransport
+        from trezorlib.transport_hid import DEVICE_IDS
         libraries_available = True
     except ImportError:
         libraries_available = False