v2.7.0

• Fix various specs that were passing incorrectly #453 (@RobinDaugherty)
• CI tests for Ruby 2.6, 2.7; Rails 6.0 #452 (@RobinDaugherty)
• CI: Drop unused sudo: false directive #457 (@olleolleolle)
• Add editor preset for VSCodium #456 (@jaredmoody)
• Show the last-raised error, not its "cause" #459 (@RobinDaugherty)
• Fix warning: FILE in eval may not return location in binding #458 (@yuuu)
• Allow skipping variable inspection by class name #449 (@felixbuenemann)