Update README.rst

fixed typo spelling of temperamental

Author: tdawry

README.rst

@@ -66,7 +66,7 @@ Usage Example
     import board
     import adafruit_scd30
 
-    # SCD-30 has tempremental I2C with clock stretching, datasheet recommends
+    # SCD-30 has temperamental I2C with clock stretching, datasheet recommends
     # starting at 50KHz
     i2c = busio.I2C(board.SCL, board.SDA,frequency=50000)
     scd = adafruit_scd30.SCD30(i2c)