Merge pull request #16 from adafruit/aht20_calibration

Calibration patch for newer AHT20's

adafruit_ahtx0.py

@@ -107,11 +107,15 @@ def reset(self) -> None:
 
     def calibrate(self) -> bool:
         """Ask the sensor to self-calibrate. Returns True on success, False otherwise"""
+        # Newer AHT20's may not succeed, so wrapping in try/except
         self._buf[0] = AHTX0_CMD_CALIBRATE
         self._buf[1] = 0x08
         self._buf[2] = 0x00
         with self.i2c_device as i2c:
-            i2c.write(self._buf, start=0, end=3)
+            try:
+                i2c.write(self._buf, start=0, end=3)
+            except Exception:  # pylint: disable=broad-except
+                pass
         while self.status & AHTX0_STATUS_BUSY:
             time.sleep(0.01)
         if not self.status & AHTX0_STATUS_CALIBRATED: