Restrict ruby version in gemspec
Restrict ruby version in gemspec

Update to #300
oktober/calagator,kerrizor/calagator,iamBalaji/Calagator,matthewkmayer/calagator,reidab/calagator,bencornelis/calagator,bencornelis/calagator,oktober/calagator,L2-D2/calagator,matthewkmayer/calagator,oktober/calagator,matthewkmayer/calagator,reidab/calagator,kerrizor/calagator,cp/calagator-1,iamBalaji/Calagator,jmcduffie32/calagator,jmcduffie32/calagator,cp/calagator-1,shawnacscott/calagator,jmcduffie32/calagator,kerrizor/calagator,bencornelis/calagator,cp/calagator-1,kerrizor/calagator,iamBalaji/Calagator,iamBalaji/Calagator,L2-D2/calagator,shawnacscott/calagator,matthewkmayer/calagator,bencornelis/calagator,L2-D2/calagator,shawnacscott/calagator,shawnacscott/calagator,L2-D2/calagator,reidab/calagator,cp/calagator-1,reidab/calagator,oktober/calagator,jmcduffie32/calagator