Opentmi-client

added metadata key-value support for results

New:
* Introduce Testcase object (39)
* Introduce resource api (40)

fix duts location in Result object

Release link Dut object for Result and drop python 2.7 support

This release brings possible to upload events.
See example [here](https://github.com/OpenTMI/opentmi-pyclient/blob/master/examples/event_post.py)

New
33 introduce event api
32 optional way to give custom logger for module in Client constructor