0.11.3

Release notes: https://github.com/DataDog/dd-trace-rb/releases/tag/v0.11.3

Git diff: v0.11.2...v0.11.3

Added

• CHANGELOG.md (#350, #363) (@awendt)
• http.request_id tag to Rack spans (#335)
• Tracer configuration to README.md (#332) (@noma4i)

Fixed

• Extra indentation in README.md (#349) (@ck3g)
• http.url when Rails raises exceptions (#351, #353)
• Rails from being patched twice (#352)
• 4XX responses from middleware being marked as errors (#345)
• Rails exception middleware sometimes not being inserted at correct position (#345)
• Processing pipeline documentation typo (#355) (@MMartyn)
• Loading the ddtrace library after Rails has fully initialized can result in load errors. (#357)
• Use of block syntax with Rails render not working (#359, #360) (@dorner)