fix a typo in README.md
fix a typo in README.md
pikselpalette/joi,thethanghn/react-native-joi,myndzi/joi,jagoda/joi,bananaoomarang/joi,opyate/joi,geminiyellow/joi,naitsric/joi,lloydbenson/joi,pandeysoni/joi,davidbenko9/joi,ck-lee/joi,jeffbski/joi,olistic/joi-extended,rmoorman/joi,myndzi/joi,tpiecora/joi,danielb2/joi,robertherber/joi-extended,cesarmarinhorj/joi