Change gemspec dependencies to '>= 1.99', '< 3' in prep for 2.0.0.beta release.
Change gemspec dependencies to '>= 1.99', '< 3' in prep for 2.0.0.beta release.

ruby-rdf/json-ld,gkellogg/json-ld,ruby-rdf/json-ld,PerfectMemory/json-ld,PerfectMemory/json-ld