v1.2.0

What's changed

• Workflow update @hwangswan (#105)
• Split test driver into modules @hwangswan (#104)
• Switch from Bash to Perl @hwangswan (#103)
• Retake classes @hwangswan (#101)
• Modifying test driver & makefile @hwangswan (#100)
• More modification on code and tests @hwangswan (#99)
• Hotfix @hwangswan (#98)