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

Hello Olivier,

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 responses 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

Theses changes are although a suggestion to solve following currently open issues and pull requests:
*   Merge Tool Artifact In Code Causes A Syntax Error https://github.com/orenault/TestLink-API-Python-client/issues/12
*   Remove merge conflicts from src/testlink/testlinkapi.py https://github.com/orenault/TestLink-API-Python-client/pull/8
*   Fix getTestCaseCustomFieldValue "version" parameter type https://github.com/orenault/TestLink-API-Python-client/pull/7
*   fix merge conflict markers. https://github.com/orenault/TestLink-API-Python-client/pull/6
*   report test case execution + upload test case attachment https://github.com/orenault/TestLink-API-Python-client/pull/3

Greetings Luiko