new TestLink-API-Python-client release candidate v0.4.5-RC1

Hello Anton,

I published a new TestLink-API-Python-client [release candidate v0.4.5-RC1](https://github.com/lczub/TestLink-API-Python-client/releases/tag/v0.4.5-RC1). 
Main target is a refactoring to
*   implement the api methods as generic methods, generated via decorators
    *    the methods supports now all optional API arguments
    *    it reduces the copy&paste code blocks
*   a handling for response with TestLink API error codes
*   the API could be asked, which methods and arguments are supported
*   the examples are extended for near all supported api methods (and necessary code changes between v0.4.0 and v.0.4.5)

Hope, you agree with these changes and integrated them into your repository.
*   Details see above v0.4.5-RC1 release note link

Greetings Luiko