chore(package): update react to version 15.2.1
chore(package): update react to version 15.2.1

https://greenkeeper.io/
liranhershko/intSights,hairmot/REACTModuleTest,tylerhq/react-fifteen,grohaus/schism-ecce-client,SodhanaLibrary/react-examples,krystalcampioni/krystalcampioni-portfolio,annaboodle/buddies,annaboodle/buddies,brz0/chart-suite,scottjbarr/companies-ui,brz0/chart-suite,roytang121/oled-visual,tylerhq/react-fifteen,SodhanaLibrary/react-examples,liranhershko/intSights,Nekimola/react-training,Nekimola/react-training,alicoding/react-webpack-babel,hairmot/REACTModuleTest,grohaus/schism-ecce-client,roytang121/oled-visual,BlackCloudConcepts/geolocLang-react-simple,roytang121/oled-visual,krystalcampioni/krystalcampioni-portfolio,BlackCloudConcepts/geolocLang-react-simple,scaphold-io/slackr-graphql-subscriptions-starter-kit,kjhwee91/react-c3js,scaphold-io/slackr-graphql-subscriptions-starter-kit,scottjbarr/companies-ui,donghee214/pathway,teemuteemu/sp_modular,teemuteemu/sp_modular,alicoding/react-webpack-babel,donghee214/pathway