Add changelog settings file.
Move debug and connection to settings.
Store settings in an array.
Fix README
Add complete changelog includer.
Remove date-showing option.
Fix syntax in settings.
Add customisable changelog form in different file.
Clean up and load form from a file.
Fix changelog form.
Add easy changelog form checking.
Add simple cleanup function.

To be edited~
Update error codes.
Update form checking.
Add error throwing function.
Add method comments, remove one global var.
Shorten the form validation.
Add a note about required MySQLI "link" argument.
Move query method to main function file.

That's because of required "link" argument.
Add change type param and working query.