README: Fixed a wording error about protocol name
README: Fixed a wording error about protocol name

gshaviv/LXReorderableCollectionViewFlowLayout,winkapp/LXReorderableCollectionViewFlowLayout,viking2009/LXReorderableCollectionViewFlowLayout,myeyesareblind/LXReorderableCollectionViewFlowLayout,Mombo-Labs/LXReorderableCollectionViewFlowLayout,zht415/LXReorderableCollectionViewFlowLayout,lxcid/LXReorderableCollectionViewFlowLayout,georgel/LXReorderableCollectionViewFlowLayout,tokorom/LXReorderableCollectionViewFlowLayout,brandons/LXReorderableCollectionViewFlowLayout,Raizlabs/LXReorderableCollectionViewFlowLayout,RamiAbouGhanem/LXReorderableCollectionViewFlowLayout,basecamp/LXReorderableCollectionViewFlowLayout