Tremor 0.9.4

New features

• Extract simd_json::BorrowedValue into tremor specific tremor-value to allow extension of the type system.

Fixed

• Terminate pipeline creation when a node already exists with the given name #650
• Fix visibility of pipeline metrics #648
• Fix panic upon usage of postgres ramps due to incompatbility with tokio and async-std runtime. #641
• Fix missing newlines when error line doesnt end with a newline #676
• Fix possible panic in random::integer and random::float when used with values <= 0. #679