Add "Volts" unit

Author: FrancescoNegri

src/spikeinterface/extractors/neoextractors/neobaseextractor.py

@@ -260,7 +260,7 @@ def __init__(
         units = signal_channels["units"]
 
         # mark that units are V, mV or uV
-        standard_units_and_additional_gains = {"V": 1e6, "Volt": 1e6, "mV": 1e3, "uV": 1.0}
+        standard_units_and_additional_gains = {"V": 1e6, "Volt": 1e6, "Volts": 1e6, "mV": 1e3, "uV": 1.0}
         self.has_non_standard_units = False
         if not np.all(np.isin(units, list(standard_units_and_additional_gains.keys()))):
             self.has_non_standard_units = True