column_rename in transform cannot take same column reference

[chinyeungli]

See #427

The problem here is the code load the config file in an ordered dictionary list with the original name as a key. Therefore, it will not work if renaming for the same reference as the "old" key's value will be replaced by the "new" key's value. In this case, the first pkg_name: about_resource will be replaced by pkg_name: name and therefore prompt error as the about_resource is no longer in the dictionary list for renaming.

[chinyeungli]

This has been fixed in the current develop branch which will be released in 5.0.0.