doc: fix the link in README.rst
doc: fix the link in README.rst

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

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