npm.md: Update docs to include json removal
npm.md: Update docs to include json removal

Signed-off-by: Brendan Le Foll <3e0e8c4069934e8b47d99704927a85c66c0ceb33@intel.com>

alext-mkrs/mraa,w4ilun/mraa,stefan-andritoiu/mraa-gpio-chardev,arfoll/mraa,whbruce/mraa,w4ilun/mraa,g-vidal/mraa,g-vidal/mraa,stefan-andritoiu/mraa-gpio-chardev,Jon-ICS/mraa,g-vidal/mraa,sergev/mraa,KurtE/mraa,intel-iot-devkit/mraa,intel-iot-devkit/mraa,arfoll/mraa,sergev/mraa,alext-mkrs/mraa,g-vidal/mraa,KurtE/mraa,jontrulson/mraa,malikabhi05/mraa,intel-iot-devkit/mraa,w4ilun/mraa,stefan-andritoiu/mraa-gpio-chardev,malikabhi05/mraa,w4ilun/mraa,ncrastanaren/mraa,sergev/mraa,sergev/mraa,Propanu/mraa,ncrastanaren/mraa,jontrulson/mraa,arunlee77/mraa,intel-iot-devkit/mraa,stefan-andritoiu/mraa,Jon-ICS/mraa,malikabhi05/mraa,ncrastanaren/mraa,ProfFan/mraa,yongli3/mraa,alext-mkrs/mraa,malikabhi05/mraa,stefan-andritoiu/mraa,ncrastanaren/mraa,g-vidal/mraa,whbruce/mraa,stefan-andritoiu/mraa,ProfFan/mraa,ProfFan/mraa,arunlee77/mraa,alext-mkrs/mraa,ncrastanaren/mraa,malikabhi05/mraa,arfoll/mraa,spitfire88/mraa,whbruce/mraa,stefan-andritoiu/mraa,yongli3/mraa,arunlee77/mraa,stefan-andritoiu/mraa-gpio-chardev,alext-mkrs/mraa,ProfFan/mraa,spitfire88/mraa,Propanu/mraa,yongli3/mraa,KurtE/mraa,spitfire88/mraa,jontrulson/mraa,jontrulson/mraa,stefan-andritoiu/mraa,KurtE/mraa,Propanu/mraa,spitfire88/mraa,yongli3/mraa,Jon-ICS/mraa,arunlee77/mraa,arfoll/mraa,intel-iot-devkit/mraa,KurtE/mraa,whbruce/mraa,yongli3/mraa,Propanu/mraa,Propanu/mraa,jontrulson/mraa,sergev/mraa,arfoll/mraa,stefan-andritoiu/mraa-gpio-chardev