Fix typo in README.md (#1)
Fix typo in README.md (#1)

The returned 'state' value for Node 2 should be 'router' instead of 'leader'.
lanyuwen/openthread,mszczodrak/openthread,fbsder/openthread,fbsder/openthread,bukepo/openthread,xiaom-GitHub/openthread,jjlee3/openthread,georgecpr/openthread,lanyuwen/openthread,GiedriusM/openthread,srickardti/openthread,openthread/openthread,xiaom-GitHub/openthread,xiaom-GitHub/openthread,chshu/openthread,mszczodrak/openthread,aeliot/openthread,abtink/openthread,openthread/openthread,chshu/openthread,Zolertia/openthread,erja-gp/openthread,bukepo/openthread,jwhui/openthread,librasungirl/openthread,abtink/openthread,fbsder/openthread,LeZhang2016/openthread,vaas-krish/openthread,erja-gp/openthread,lanyuwen/openthread,fbsder/openthread,nibanks/openthread,turon/openthread,mszczodrak/openthread,chshu/openthread,JakubBrachTieto/openthread,vaas-krish/openthread,JiahuiZHONG/Internship_Thread,JakubBrachTieto/openthread,chshu/openthread,erja-gp/openthread,Zolertia/openthread,nibanks/openthread,aeliot/openthread,erja-gp/openthread,pvanhorn/openthread,JakubBrachTieto/openthread,LeZhang2016/openthread,turon/openthread,jwhui/openthread,aeliot/openthread,JakubBrachTieto/openthread,librasungirl/openthread,mszczodrak/openthread,abtink/openthread,GiedriusM/openthread,jjlee9/openthread,mszczodrak/openthread,georgecpr/openthread,gandreello/openthread,jjlee3/openthread,jjlee9/openthread,bukepo/openthread,lanyuwen/openthread,librasungirl/openthread,chshu/openthread,JiahuiZHONG/Internship_Thread,pvanhorn/openthread,lanyuwen/openthread,gandreello/openthread,JakubBrachTieto/openthread,lanyuwen/openthread,jjlee9/openthread,vaas-krish/openthread,jwhui/openthread,erja-gp/openthread,georgecpr/openthread,vaas-krish/openthread,pvanhorn/openthread,nibanks/openthread,jjlee3/openthread,gandreello/openthread,xiaom-GitHub/openthread,georgecpr/openthread,JiahuiZHONG/Internship_Thread,JakubBrachTieto/openthread,gandreello/openthread,openthread/openthread,LeZhang2016/openthread,gandreello/openthread,srickardti/openthread,vaas-krish/openthread,aeliot/openthread,jjlee9/openthread,LeZhang2016/openthread,openthread/openthread,vaas-krish/openthread,GiedriusM/openthread,jjlee9/openthread,fbsder/openthread,jjlee9/openthread,librasungirl/openthread,LeZhang2016/openthread,xiaom-GitHub/openthread,Zolertia/openthread,GiedriusM/openthread,nibanks/openthread,georgecpr/openthread,jjlee3/openthread,mszczodrak/openthread,pvanhorn/openthread,bukepo/openthread,turon/openthread,fbsder/openthread,srickardti/openthread,aeliot/openthread,nibanks/openthread,jwhui/openthread,chshu/openthread,erja-gp/openthread,GiedriusM/openthread,pvanhorn/openthread,georgecpr/openthread,srickardti/openthread,xiaom-GitHub/openthread,abtink/openthread,Zolertia/openthread,aeliot/openthread,gandreello/openthread,JiahuiZHONG/Internship_Thread,pvanhorn/openthread,nibanks/openthread,Zolertia/openthread,LeZhang2016/openthread,jjlee3/openthread,turon/openthread