Update node-helper files

Author: bouwew

plugwise_usb/nodes/helpers/counter.py

@@ -316,4 +316,3 @@ def update(
         energy = self.energy
         _LOGGER.debug("energy=%s on last_update=%s", energy, last_update)
         return (energy, last_reset)
-

plugwise_usb/nodes/helpers/firmware.py

@@ -46,6 +46,7 @@ class SupportedVersions(NamedTuple):
     # Proto release
     datetime(2015, 6, 16, 21, 9, 10, tzinfo=UTC): SupportedVersions(min=2.0, max=2.6),
     datetime(2015, 6, 18, 14, 0, 54, tzinfo=UTC): SupportedVersions(min=2.0, max=2.6),
+    datetime(2015, 9, 18, 8, 53, 15, tzinfo=UTC): SupportedVersions(min=2.0, max=2.5),
     # New Flash Update
     datetime(2017, 7, 11, 16, 6, 59, tzinfo=UTC): SupportedVersions(min=2.0, max=2.6),
 }