Update Gemfile.lock to fix security allerts
Update Gemfile.lock to fix security allerts

Update dependency version as below to fix security alerts:
gem "i18n", ">= 0.6.6"
gem "rest-client", ">= 1.7.3"
gem "activesupport", ">= 4.1.11"
ibmdb/db2rubybuildpack1,ibmdb/db2rubybuildpack1