Rails 5.0 builds are failing, because the sqlite3 version being installed doesn't meet the requirements Rails 5.0 sets.
This PR locks the rails 5.0 gemfile to the same version requirement that rails 5.0 uses. It also switches to run against ruby 2.6 instead of head which is now past 2.6 and has several deprecations causing failures.
Rails 5.0 builds are failing, because the sqlite3 version being installed doesn't meet the requirements Rails 5.0 sets.
This PR locks the rails 5.0 gemfile to the same version requirement that rails 5.0 uses. It also switches to run against ruby 2.6 instead of head which is now past 2.6 and has several deprecations causing failures.