update rails_lti2_provider gem version to latest
update rails_lti2_provider gem version to latest

Change-Id: Iec81b09e42b3855874e724eaece5bb35c4ae0576

instructure/lti_tool_provider_example,instructure/lti_tool_provider_example,instructure/lti_tool_provider_example,instructure/lti_tool_provider_example