Update dependency ebaysdk to v2.2.0

This MR contains the following updates:

Package	Update	Change
ebaysdk	minor	==2.1.5 -> ==2.2.0

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Release Notes

timotheus/ebaysdk-python

v2.2.0: Enable HTTPS by default

2.2.0 Mon Apr 20 15:23:53 PDT 2020

• Forced HTTPS for finding, shopping, and trading calls
• fixed sample code so that it uses the appropriate domain
• added py38 to tox testing

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