Fix pagebucket creation curl call in README
Fix pagebucket creation curl call in README

gwicke/restbase,inverno/restbase,wikimedia/mediawiki-services-restbase,wikimedia/hyperswitch,inverno/restbase,Pchelolo/restbase,d00rman/restbase,hardikj/restbase,eevans/restbase,d00rman/restbase,cscott/restbase,cscott/restbase,eevans/restbase,hardikj/restbase,wikimedia/mediawiki-services-restbase,milimetric/restbase,gwicke/restbase,Krenair/restbase,Krenair/restbase,Pchelolo/restbase,physikerwelt/restbase,wikimedia/restbase,milimetric/restbase,physikerwelt/restbase,wikimedia/restbase