Basictracer

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- Nothing changed yet.

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- Unpin OpenTracing dependency and change to a range (40) <Nathan Hsieh>
- Add support for Python 3.5+ (39) <Aliaksei Urbanski>
- Include 0,1 as acceptable sampled value (37) <Dominik Janků>

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- Update our OT dependency to 2.0.0.
- Implement ScopeManager for in-process propagation.

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- Update OT dependency to >=1.2.1 and <2.0.

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- Bump the minor version :-/

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- Adjust to OT logging changes