Vacuum: add fan speed preset for gen1 firmwares 3.5.8+ (rytilahti#893)

* Update vacuum.py for FW 3.5.8

Create a new class of fan speed for Firmware 3.5.8:
Silent = 38
Standard = 60
Turbo = 75
Max =100

* Update vacuum.py

* Fix linting

Co-authored-by: Teemu R <tpr@iki.fi>

miio/vacuum.py

@@ -67,6 +67,13 @@ class FanspeedV2(enum.Enum):
     Gentle = 105
 
 
+class FanspeedV3(enum.Enum):
+    Silent = 38
+    Standard = 60
+    Medium = 75
+    Turbo = 100
+
+
 class FanspeedE2(enum.Enum):
     # Original names from the app: Gentle, Silent, Standard, Strong, Max
     Gentle = 41
@@ -503,7 +510,9 @@ def _autodetect_model(self):
             fw_version = info.firmware_version
             version, build = fw_version.split("_")
             version = tuple(map(int, version.split(".")))
-            if version >= (3, 5, 7):
+            if version >= (3, 5, 8):
+                self._fanspeeds = FanspeedV3
+            elif version == (3, 5, 7):
                 self._fanspeeds = FanspeedV2
             else:
                 self._fanspeeds = FanspeedV1