input: Write a python function to predict temperature using a linear regression model. 
  assert round(predict_temperature(2023, 10, 15)) == 20 
  assert round(predict_temperature(2022, 5, 21)) == 18 
  assert round(predict_temperature(2021, 1, 1)) == 15
output: def predict_temperature(year, month, day):
      # Coefficients for a dummy linear regression model (just for example purposes)
      intercept = -5.0
      year_coeff = 0.01
      month_coeff = 0.5
      day_coeff = 0.2
      
      # Linear regression prediction formula
      temperature = intercept + (year_coeff * year) + (month_coeff * month) + (day_coeff * day)
      
      return temperature