Mitigate race condition when under load #43
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When under high parallel load, multiple requests to check if the trace has already started can get through a race condition and throw an error. The race condition exists because #24 swapped us from a GenServer to an ETS table because the GenServer mailbox was getting overloaded. We now check that condition and don't start a trace (the parallel load state this happens in ensures that a trace will start for at least one of the calls).
Fixes #41.