fix BME280 support to actually work (now tested)

uPySensor.py

@@ -16,7 +16,22 @@ class BME280(uPySensor):
         self.handle = self.bme280.BME280(i2c=self.i2c)
 
     def update_sensor(self):
-        self.temperature, self.pressure, self.humidity = self.handle.values()
+        t, p, h = self.handle.values
+        self.temperature = float(t[:-1])
+        self.pressure = float(p[:-3])
+        self.humidity = float(h[:-1])
+
+    def read_tempC(self):
+        self.update_sensor()
+        return self.temperature
+
+    def read_hum(self):
+        self.update_sensor()
+        return self.humidity
+
+    def read_pressure(self):
+        self.update_sensor()
+        return self.pressure
 
 class LM75A(uPySensor):
     LM75A_ADDRESS = 0x48