add a section on correctly using tracer with minitest/autorun #144
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What does this PR do?
Adds a note to README about possible issues when using minitest/autorun
Motivation
minitest/autorun registers at_exit hook that runs the test suite. Datadog::Core also registers at_exit hook that stops Tracing worker. As hooks are executed in LIFO order, Datadog must be required first: that way test suite is being run and then Tracing is stopped. Otherwise, tests are being run without tracing enabled.