Revert "Update the gemfile entry so that users can use version 1.6.3 or higher"
Revert "Update the gemfile entry so that users can use version 1.6.3 or higher"

This reverts commit cf08dbeb856d59be48ba39db045ec1429b6f061d.

rshell/oracle-enhanced,ifad/oracle-enhanced,ifad/oracle-enhanced,rsim/oracle-enhanced,luke2237/oracle-enhanced,Eric-Guo/oracle-enhanced,cdinger/oracle-enhanced,umn-asr/oracle-enhanced,rsim/oracle-enhanced,yahonda/oracle-enhanced,luke2237/oracle-enhanced,umn-asr/oracle-enhanced,umn-asr/oracle-enhanced,swaroopmurthy/oracle-enhanced,cdinger/oracle-enhanced,yahonda/oracle-enhanced,rshell/oracle-enhanced,ifad/oracle-enhanced,scottschulthess/oracle-enhanced,claptimes5/oracle-enhanced