v0.7.0

Added

• New ParentOrElse sampler for fallback logic if parent is not sampled. #128
• Attributes can now have array values #146
• Added record_exception and record_exception_with_stacktrace methods to Span #152

Changed

• Update sampler types #128
  • Always is now AlwaysOn. Never is now AlwaysOff. Probability now ignores parent
    sampled state.
• base64 and binary_propagator have been moved to experimental module. #134
• Correlation-Context header has been updated to otcorrelations #145
• B3Propagator has been updated to more closely follow the spec #148