Fix required Ruby version in gemspec
Fix required Ruby version in gemspec

suyesh/opal,kachick/opal,Mogztter/opal,gausie/opal,Flikofbluelight747/opal,jannishuebl/opal,merongivian/opal,jgaskins/opal,fazibear/opal,merongivian/opal,Ajedi32/opal,opal/opal,jannishuebl/opal,jannishuebl/opal,Mogztter/opal,Flikofbluelight747/opal,merongivian/opal,wied03/opal,jgaskins/opal,suyesh/opal,fazibear/opal,iliabylich/opal,opal/opal,gausie/opal,kachick/opal,Ajedi32/opal,gausie/opal,Ajedi32/opal,kachick/opal,iliabylich/opal,Mogztter/opal,jgaskins/opal,opal/opal,Mogztter/opal,wied03/opal,wied03/opal,Flikofbluelight747/opal,suyesh/opal,kachick/opal,iliabylich/opal,opal/opal,fazibear/opal