Fix DHT11 bug -> adafruit#48

Author: techman83

DHT.cpp

@@ -151,10 +151,6 @@ boolean DHT::read(bool force) {
     // and we don't want any interruptions.
     InterruptLock lock;
 
-    // End the start signal by setting data line high for 40 microseconds.
-    digitalWrite(_pin, HIGH);
-    delayMicroseconds(40);
-
     // Now start reading the data line to get the value from the DHT sensor.
     pinMode(_pin, INPUT_PULLUP);
     delayMicroseconds(10);  // Delay a bit to let sensor pull data line low.