Fix typo that causes error in ruby 1.8.7
Fix typo that causes error in ruby 1.8.7

InviteEducation/ruby-saml,jobscore/ruby-saml,itrp/ruby-saml,10Kft/ruby-saml,zipnosis/ruby-saml,onelogin/ruby-saml,OurHealth/ruby-saml,ksinkar/ruby-saml