feature: add supports presets flag

pyasic/miners/backends/vnish.py

@@ -95,6 +95,7 @@ class VNish(VNishFirmware, BMMiner):
     web: VNishWebAPI
 
     supports_shutdown = True
+    supports_presets = True
 
     data_locations = VNISH_DATA_LOC
 

pyasic/miners/base.py

@@ -56,6 +56,7 @@ class MinerProtocol(Protocol):
 
     supports_shutdown: bool = False
     supports_power_modes: bool = False
+    supports_presets: bool = False
     supports_autotuning: bool = False
 
     api_ver: str = None