v3.1.13 (2020/05/01)
- Fixed a bug that an error occurs when the custom column type is "File" and "Image" and the "Required" setting is set and the file is not attached when updating the data.
- Fixed a bug that the cache is not refreshed when "Role group" is set on the "User" screen when the cache is enabled.
- Fixed a bug that the plug-in type "script" is not loaded at runtime with F5
- Enhanced validation of custom column setting "Enter only once"
- Other minor corrections