Update to Altitude setter

Author: Andrew Smith

adafruit_bmp280.py

@@ -369,13 +369,10 @@ def altitude(self) -> float:
         p = self.pressure  # in Si units for hPascal
         return 44330 * (1.0 - math.pow(p / self.sea_level_pressure, 0.1903))
 
-    @property
-    def p0(self, altitude_m=0.0) -> float:
-        """The calculated sea level pressure based on altitude (:attr:`altitude`)
-        - which you must enter ahead of time)"""
+    @altitude.setter
+    def altitude(self, value: float) -> None:
         p = self.pressure  # in Si units for hPascal
-        p0 = p / math.pow(1.0 - altitude_m/44330.0, 5.255)
-        return p0
+        self.sea_level_pressure = p / math.pow(1.0 - value/44330.0, 5.255)
 
     ####################### Internal helpers ################################
     def _read_coefficients(self) -> None: