cmake: increase version to 2.3
cmake: increase version to 2.3

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

damcclos/mraa,stefan-andritoiu/mraa,neuroidss/mraa,ncrastanaren/mraa,intel-iot-devkit/mraa,neuroidss/mraa,allela-roy/mraa,Hbrinj/mraa,spitfire88/mraa,Propanu/mraa,arunlee77/mraa,Kiritoalex/mraa,spitfire88/mraa,stefan-andritoiu/mraa,pctj101/mraa,alex1818/mraa,sundw2014/mraa,noahchense/mraa,allela-roy/mraa,sergev/mraa,stefan-andritoiu/mraa-gpio-chardev,seem-sky/mraa,Hbrinj/mraa,alex1818/mraa,whbruce/mraa,anonymouse64/mraa,nioinnovation/mraa,andreivasiliu2211/mraa,stefan-andritoiu/mraa,yangjae/mraa,tripzero/mraa,ProfFan/mraa,KurtE/mraa,noahchense/mraa,ncrastanaren/mraa,malikabhi05/mraa,sergev/mraa,w4ilun/mraa,Meirtz/mraa,neuberfran/mraa,yongli3/mraa,andreivasiliu2211/mraa,alexandru-elisei/mraa,noahchense/mraa,malikabhi05/mraa,g-vidal/mraa,allela-roy/mraa,arunlee77/mraa,whbruce/mraa,alext-mkrs/mraa,arunlee77/mraa,SyrianSpock/mraa,Pillar1989/mraa,w4ilun/mraa,petreeftime/mraa,intel-iot-devkit/mraa,seem-sky/mraa,KurtE/mraa,petreeftime/mraa,alext-mkrs/mraa,g-vidal/mraa,yoyojacky/mraa,alexandru-elisei/mraa,spitfire88/mraa,jontrulson/mraa,andreivasiliu2211/mraa,Hbrinj/mraa,arfoll/mraa,ncrastanaren/mraa,alex1818/mraa,SyrianSpock/mraa,malikabhi05/mraa,Jon-ICS/mraa,Meirtz/mraa,malikabhi05/mraa,yongli3/mraa,zBMNForks/mraa,stefan-andritoiu/mraa,ncrastanaren/mraa,ProfFan/mraa,w4ilun/mraa,KurtE/mraa,yangjae/mraa,stefan-andritoiu/mraa,smileboywtu/mraa,Kiritoalex/mraa,arfoll/mraa,alexandru-elisei/mraa,KurtE/mraa,SyrianSpock/mraa,ncrastanaren/mraa,zBMNForks/mraa,sergev/mraa,nioinnovation/mraa,yoyojacky/mraa,sundw2014/mraa,KurtE/mraa,stefan-andritoiu/mraa-gpio-chardev,whbruce/mraa,sundw2014/mraa,Pillar1989/mraa,neuberfran/mraa,arfoll/mraa,damcclos/mraa,timrtoo/Intel,malikabhi05/mraa,timrtoo/Intel,Hbrinj/mraa,jontrulson/mraa,smileboywtu/mraa,tripzero/mraa,alext-mkrs/mraa,damcclos/mraa,Jon-ICS/mraa,noahchense/mraa,arfoll/mraa,timrtoo/Intel,yongli3/mraa,ProfFan/mraa,seem-sky/mraa,tripzero/mraa,yoyojacky/mraa,neuberfran/mraa,arfoll/mraa,neuroidss/mraa,pctj101/mraa,arunlee77/mraa,yongli3/mraa,alext-mkrs/mraa,petreeftime/mraa,andreivasiliu2211/mraa,sundw2014/mraa,Meirtz/mraa,timrtoo/Intel,yangjae/mraa,stefan-andritoiu/mraa-gpio-chardev,jontrulson/mraa,g-vidal/mraa,smileboywtu/mraa,matt-auld/mraa,yangjae/mraa,mircea/mraa,stefan-andritoiu/mraa-gpio-chardev,neuberfran/mraa,ProfFan/mraa,intel-iot-devkit/mraa,pctj101/mraa,Propanu/mraa,timrtoo/Intel,alext-mkrs/mraa,anonymouse64/mraa,petreeftime/mraa,Jon-ICS/mraa,intel-iot-devkit/mraa,whbruce/mraa,alexandru-elisei/mraa,STANAPO/mraa,Propanu/mraa,Kiritoalex/mraa,mircea/mraa,pctj101/mraa,STANAPO/mraa,zBMNForks/mraa,jontrulson/mraa,Propanu/mraa,seem-sky/mraa,anonymouse64/mraa,w4ilun/mraa,yongli3/mraa,noahchense/mraa,matt-auld/mraa,matt-auld/mraa,stefan-andritoiu/mraa-gpio-chardev,intel-iot-devkit/mraa,Propanu/mraa,g-vidal/mraa,spitfire88/mraa,pctj101/mraa,nioinnovation/mraa,Pillar1989/mraa,seem-sky/mraa,STANAPO/mraa,alexandru-elisei/mraa,mircea/mraa,g-vidal/mraa,neuberfran/mraa,sundw2014/mraa,sergev/mraa,jontrulson/mraa,sergev/mraa