Small typo fix in NSString+SSToolkitAdditions.h (recieved -> received)
Small typo fix in NSString+SSToolkitAdditions.h (recieved -> received)

samsoffes/sstoolkit,andaluz/sstoolkit,k131050059/sstoolkit,lijie121210/sstoolkit,SuPair/sstoolkit,zilaiyedaren/sstoolkit,carabina/sstoolkit,sideci-sample/sideci-sample-sstoolkit,zjh171/sstoolkit,cobook/sstoolkit,TDness/sstoolkit,Amnysia/SSToolkit,soffes/sstoolkit,samsoffes/sstoolkit,Amnysia/SSToolkit,rtsbtx/sstoolkit