Update README.md

Author: microphonon

README.md

@@ -5,7 +5,7 @@ Device is periodically polled by the MCU in on-demand mode. No temp or humidity
 Low-level I2C communication using registers, interrupts, and MCU LPM0 mode. Display data on terminal program.
 Temperature resolution: 14-bit and displayed with 4 significant figures.
 Humidity resolution: 11-bit displayed with 3 significant figures. Ground the ADR pin to set slave address at 0X40.
-Sensor is briefly heated at startup/reset; heater draws 90 mA at 3.3V
+Sensor is briefly heated at startup/reset; heater draws 90 mA at 3.3V.
 Main loop runs with timed interrupt from LPM3 and VLO clock. I2C clock 100 kHz; UART 9600 baud.
 IDE with CCS 6.1.3 and nofloat printf support.