Fix Gemfile.lock
Fix Gemfile.lock

It seems bundle install has not been executed for a while;  which
results in bundle install fetching new version of activemodel and
activesupport getting installed whenever I execute `bundle install` on
the master branch, changing Gemfile.lock file.

This commit reflects current Gem dependency to Gemfile.lock so that
bundle install will not Gemfile.lock

likuolin/ib-ruby,ib-ruby/ib-ruby,likuolin/ib-ruby,ib-ruby/ib-ruby,likuolin/ib-ruby,ib-ruby/ib-ruby,ib-ruby/ib-ruby,likuolin/ib-ruby