Enable inheritance by making key methods protected

[wezzix]

Please make key methods such as FreshDesk.SendGetRequest protected, such that we can inherit from FreshDesk and add any missing API methods. For example I'm missing GetCustomerById among other things, but i have to copy and modify the project instead of inheriting, which causes duplication.
Thanks

[MarkMilfordMe]

@wezzix did you still need this done? If so did you have a PR to submit?

[wezzix]

@MarkMilfordMe I cloned the project many years ago and forgot all about it since, so currently I have no particular need. I'm sure the argument still stands for new users though.
Thanks