Version 0.18.0

• [#352][instrumentation-grpc-client] Fixes trace identifiers not being not correctly cleaned up after setting them in the grpc interceptor. Thanks to @high-stakes
• [#355][instrumentation-request] Fixes mutation in the context in httpclient.recordResponse. Thanks to @chris-smith-zocdoc
• [#357][instrumentation-kafkajs] Adds instrumentation for kafkajs. Thanks to @high-stakes