doc: announce OF1.4 support in README
doc: announce OF1.4 support in README

We support good a good portion of OF1.4.

Signed-off-by: FUJITA Tomonori <93dac1fe9c4b2a3957982200319981492ad4976e@lab.ntt.co.jp>

fujita/ryu,haniehrajabi/ryu,jazzmes/ryu,alyosha1879/ryu,John-Lin/ryu,lagopus/ryu-lagopus-ext,pichuang/ryu,shinpeimuraoka/ryu,takahashiminoru/ryu,shinpeimuraoka/ryu,ynkjm/ryu,alyosha1879/ryu,shinpeimuraoka/ryu,umkcdcrg01/ryu_openflow,osrg/ryu,Tejas-Subramanya/RYU_MEC,darjus-amzn/ryu,zangree/ryu,TakeshiTseng/ryu,fujita/ryu,Tesi-Luca-Davide/ryu,alanquillin/ryu,zangree/ryu,ysywh/ryu,hisaharu/ryu,yamada-h/ryu,shinpeimuraoka/ryu,alyosha1879/ryu,haniehrajabi/ryu,darjus-amzn/ryu,Tejas-Subramanya/RYU_MEC,TakeshiTseng/ryu,fkakuma/ryu,takahashiminoru/ryu,StephenKing/summerschool-2015-ryu,alanquillin/ryu,torufuru/oolhackathon,ynkjm/ryu,sivaramakrishnansr/ryu,zyq001/ryu,jazzmes/ryu,umkcdcrg01/ryu_openflow,Tesi-Luca-Davide/ryu,gareging/SDN_Framework,ysywh/ryu,iwaseyusuke/ryu,lzppp/mylearning,hisaharu/ryu,diogommartins/ryu,Tejas-Subramanya/RYU_MEC,gareging/SDN_Framework,ynkjm/ryu,shinpeimuraoka/ryu,StephenKing/ryu,lsqtongxin/ryu,StephenKing/ryu,torufuru/oolhackathon,jalilm/ryu,Tesi-Luca-Davide/ryu,ynkjm/ryu,darjus-amzn/ryu,muzixing/ryu,castroflavio/ryu,StephenKing/ryu,TakeshiTseng/ryu,takahashiminoru/ryu,StephenKing/ryu,lagopus/ryu-lagopus-ext,castroflavio/ryu,gopchandani/ryu,Zouyiran/ryu,ttsubo/ryu,jalilm/ryu,Zouyiran/ryu,evanscottgray/ryu,StephenKing/ryu,lzppp/mylearning,haniehrajabi/ryu,mikhaelharswanto/ryu,Zouyiran/ryu,fujita/ryu,gareging/SDN_Framework,elahejalalpour/ELRyu,elahejalalpour/ELRyu,Zouyiran/ryu,John-Lin/ryu,elahejalalpour/ELRyu,pichuang/ryu,Tejas-Subramanya/RYU_MEC,zangree/ryu,gareging/SDN_Framework,zyq001/ryu,lagopus/ryu-lagopus-ext,iwaseyusuke/ryu,umkcdcrg01/ryu_openflow,osrg/ryu,ysywh/ryu,ntts-clo/mld-ryu,hisaharu/ryu,Tesi-Luca-Davide/ryu,diogommartins/ryu,gopchandani/ryu,takahashiminoru/ryu,jazzmes/ryu,jalilm/ryu,osrg/ryu,darjus-amzn/ryu,OpenState-SDN/ryu,yamt/ryu,pichuang/ryu,fkakuma/ryu,habibiefaried/ryu,Zouyiran/ryu,John-Lin/ryu,yamt/ryu,mikhaelharswanto/ryu,StephenKing/summerschool-2015-ryu,Tejas-Subramanya/RYU_MEC,openvapour/ryu,alanquillin/ryu,ttsubo/ryu,gopchandani/ryu,gareging/SDN_Framework,hisaharu/ryu,elahejalalpour/ELRyu,yamt/ryu,muzixing/ryu,iwaseyusuke/ryu,openvapour/ryu,alanquillin/ryu,o3project/ryu-oe,StephenKing/summerschool-2015-ryu,jalilm/ryu,torufuru/OFPatchPanel,ttsubo/ryu,ysywh/ryu,zyq001/ryu,haniehrajabi/ryu,OpenState-SDN/ryu,ynkjm/ryu,hisaharu/ryu,darjus-amzn/ryu,evanscottgray/ryu,muzixing/ryu,muzixing/ryu,elahejalalpour/ELRyu,ntts-clo/ryu,sivaramakrishnansr/ryu,lzppp/mylearning,TakeshiTseng/ryu,umkcdcrg01/ryu_openflow,alanquillin/ryu,gopchandani/ryu,yamada-h/ryu,fkakuma/ryu,lsqtongxin/ryu,OpenState-SDN/ryu,zangree/ryu,diogommartins/ryu,torufuru/oolhackathon,muzixing/ryu,openvapour/ryu,jkoelker/ryu,Tesi-Luca-Davide/ryu,iwaseyusuke/ryu,zyq001/ryu,torufuru/OFPatchPanel,OpenState-SDN/ryu,fkakuma/ryu,ttsubo/ryu,zyq001/ryu,lsqtongxin/ryu,alyosha1879/ryu,lagopus/ryu-lagopus-ext,fkakuma/ryu,ntts-clo/ryu,iwaseyusuke/ryu,jalilm/ryu,diogommartins/ryu,takahashiminoru/ryu,diogommartins/ryu,John-Lin/ryu,OpenState-SDN/ryu,habibiefaried/ryu,ttsubo/ryu,o3project/ryu-oe,fujita/ryu,pichuang/ryu,openvapour/ryu,umkcdcrg01/ryu_openflow,osrg/ryu,fujita/ryu,yamt/ryu,habibiefaried/ryu,haniehrajabi/ryu,lzppp/mylearning,ysywh/ryu,sivaramakrishnansr/ryu,osrg/ryu,habibiefaried/ryu,lsqtongxin/ryu,evanscottgray/ryu,lsqtongxin/ryu,pichuang/ryu,sivaramakrishnansr/ryu,jkoelker/ryu,StephenKing/summerschool-2015-ryu,castroflavio/ryu,lagopus/ryu-lagopus-ext,sivaramakrishnansr/ryu,gopchandani/ryu,John-Lin/ryu,yamt/ryu,StephenKing/summerschool-2015-ryu,habibiefaried/ryu,openvapour/ryu,lzppp/mylearning,TakeshiTseng/ryu,jkoelker/ryu,ntts-clo/mld-ryu,zangree/ryu