The DHTxx series sometimes come with 3 pins although the actual sensor itself happens to have 4 pins, So I made an update on the comment to help anyone who might find it sketchy ...Thanks

Updated comment on the Pin Out of the DHTxx Sensors

Use const instead of defines for sensors types

Fix comment on DHT22 and DHT21 variables

When trying to read temperature from a DHT11 when the sensor was
disconnected, the program would encounter an infinite loop in
DHT::expectPulse, because count would keep overflowing.

Fix infinite loop on STM32F103

Update version number to 1.4.6