Fix I2C Error during wakeup, add retry logic

Fixes #13

Adafruit_AM2320.cpp

@@ -130,15 +130,25 @@ uint32_t Adafruit_AM2320::readRegister32(uint8_t reg) {
   uint8_t buffer[8] = {0, 0, 0, 0, 0, 0, 0, 0};
 
   // wake up
-  i2c_dev->write(buffer, 1);
-  delay(10); // wait 10 ms
+  bool writtenBytes = i2c_dev->write(buffer, 1);
+  delay(10); // wait 10 ms to wake up
+  if(!writtenBytes){
+    delay(90); // wait remainder of 100ms for wakeup before retrying
+    i2c_dev->write(buffer, 1);
+    delay(10); // wait 10 ms to wake up
+  }
 
   // send a command to read register
   buffer[0] = AM2320_CMD_READREG;
   buffer[1] = reg;
   buffer[2] = 4; // 4 bytes
-  i2c_dev->write(buffer, 3);
+  writtenBytes = i2c_dev->write(buffer, 3);
   delay(2); // wait 2 ms
+  if(!writtenBytes){
+    //try once more...
+    writtenBytes = i2c_dev->write(buffer, 3);
+    delay(2); // wait 2 ms
+  }
 
   // 2 bytes preamble, 4 bytes data, 2 bytes CRC
   i2c_dev->read(buffer, 8);