Update README.markdown
Update README.markdown

Remove references to 'key' argument, which is no longer needed.
KimBin/Locksmith,agustindc-rga/Locksmith,augmify/Locksmith,liuruxian/Locksmith,nvh/Locksmith,agustindc-rga/Locksmith,wimirwan/Locksmith,pheld/Locksmith,voidException/Locksmith,agustindc-rga/Locksmith,summerHearts/Locksmith,agustindc-rga/Locksmith,hejunbinlan/Locksmith,getaaron/Locksmith,tucali/Locksmith,getaaron/Locksmith,vasco2ramos/Locksmith,vasco2ramos/Locksmith,gfontenot/Locksmith,jwells47/Locksmith,carabina/Locksmith,voidException/Locksmith,summerHearts/Locksmith,pheld/Locksmith,augmify/Locksmith,matthewpalmer/Locksmith,bestwpw/Locksmith,owenwuef/Locksmith,colemancda/Locksmith,nvh/Locksmith,jwells47/Locksmith,jwells47/Locksmith,KimBin/Locksmith,hejunbinlan/Locksmith,nvh/Locksmith,liuruxian/Locksmith,getaaron/Locksmith,augmify/Locksmith,liuruxian/Locksmith,hermanolsson/Locksmith,owenwuef/Locksmith,alessandrostone/Locksmith,jwells47/Locksmith,augmify/Locksmith,gfontenot/Locksmith,colemancda/Locksmith,matthewpalmer/Locksmith,agustindc-rga/Locksmith,owenwuef/Locksmith,gfontenot/Locksmith,jwells47/Locksmith,getaaron/Locksmith,alessandrostone/Locksmith,hermanolsson/Locksmith,owenwuef/Locksmith,owenwuef/Locksmith,tucali/Locksmith,carabina/Locksmith,liuruxian/Locksmith,augmify/Locksmith,wimirwan/Locksmith,gfontenot/Locksmith,nvh/Locksmith,liuruxian/Locksmith,nvh/Locksmith,bestwpw/Locksmith,getaaron/Locksmith,gfontenot/Locksmith