DB2 for i doesn't support renaming of columns

[infosuitemka]

Trying to get Keycloak running on DB2 for i a blocking issue that I encounter, is this:
Reason: liquibase.exception.DatabaseException: [SQL0199] Keyword RENAME was not expected. Valid tokens: ADD LOG NOT SET DATA DROP ALTER CHECK APPEND ATTACH DETACH. [Failed SQL: (-199) ALTER TABLE "IFSKCTST".EVENT_ENTITY RENAME COLUMN TIME TO EVENT_TIME]

I propose adding an additional generator called RenameColumnGeneratorDB2i which is subclass of RenameColumnGenerator overriding,

    @Override
    public boolean supports(RenameColumnStatement statement, Database database) {
        return false;
    }

I could contribute this change myself through a pull request, if you are interested? Do I need to sign up for something before code PR can be integrated?