readme: update example and notice on API changes to grove and i2clcd
readme: update example and notice on API changes to grove and i2clcd

Signed-off-by: Mihai Tudor Panu <a27de6130c5d32f5817bf40bb8b348582f37a8af@intel.com>

nitirohilla/upm,g-vidal/upm,pylbert/upm,pylbert/upm,pylbert/upm,intel-iot-devkit/upm,sasmita/upm,malikabhi05/upm,Propanu/upm,Jon-ICS/upm,skiselev/upm,malikabhi05/upm,stefan-andritoiu/upm,pylbert/upm,stefan-andritoiu/upm,sasmita/upm,pylbert/upm,stefan-andritoiu/upm,spitfire88/upm,Jon-ICS/upm,sasmita/upm,intel-iot-devkit/upm,jontrulson/upm,skiselev/upm,pylbert/upm,spitfire88/upm,Propanu/upm,spitfire88/upm,jontrulson/upm,g-vidal/upm,malikabhi05/upm,jontrulson/upm,Propanu/upm,malikabhi05/upm,jontrulson/upm,malikabhi05/upm,skiselev/upm,spitfire88/upm,nitirohilla/upm,stefan-andritoiu/upm,nitirohilla/upm,stefan-andritoiu/upm,sasmita/upm,Propanu/upm,nitirohilla/upm,skiselev/upm,g-vidal/upm,malikabhi05/upm,intel-iot-devkit/upm,Jon-ICS/upm,skiselev/upm,Propanu/upm,g-vidal/upm,Jon-ICS/upm,spitfire88/upm,g-vidal/upm,intel-iot-devkit/upm,skiselev/upm,intel-iot-devkit/upm,nitirohilla/upm,Propanu/upm,sasmita/upm,intel-iot-devkit/upm,stefan-andritoiu/upm,Jon-ICS/upm,g-vidal/upm,jontrulson/upm