Bump to version 1.6.0

[TonyCTHsu]

[1.6.0] - 2022-11-15

Added

• Trace level tags propagation in distributed tracing ([Trace Tags Propagation in Distributed Traces  #2260][])
• [hanami]: Hanami 1.x instrumentation ([Add Hanami 1.x instrumentation #2230][])
• [pg, mysql2]: option comment_propagation for SQL comment propagation, default is disabled ([SQL comment propagation for pg #2339][])([SQL comment propagation for mysql2 #2324][])

Changed

• [rack, sinatra]: Squash nested spans and improve patching mechanism.
  No need to register Datadog::Tracing::Contrib::Sinatra::Tracer([Squash nested sinatra/rack request span #2217][])
• [rails, rack]: Fix Non-GET request method with rails exception controller ([Fix Non-GET request method with rails exception controller #2317][])
• Upgrade to libdatadog 0.9.0.1.0 ([Upgrade to libdatadog 0.9.0.1.0 #2302][])
• Remove legacy profiling transport ([[PROF-6070] Remove legacy profiling transport #2062][])

Fixed

• [redis]: Fix redis instance configuration, not on client ([Fix Redis configuration pin #2363][])

# Change your code from
Datadog.configure_onto(redis.client, service_name: '...')
# to
Datadog.configure_onto(redis, service_name: '...')

• Allow DD_TAGS values to have the colon character ([Allow DD_TAGS values to have the colon character #2292][])
• Ensure that TraceSegment can be reported correctly when they are dropped ([Ensure that Datadog::Tracing::TraceSegment can be reported correctly when they are dropped #2335][])
• Docs: Fixes upgrade guide on configure_onto ([Fixes upgrade guide on configure_onto #2307][])
• Fix environment logger with IO transport ([Fix agent_url in environment logger when io transport  #2313][])