0.18.0 / 2018-01-24

• [BUGFIX] Dogshell: Service checks can be sent with optional parameters set to null values, #241 (thanks @timvisher)
• [BUGFIX] Dogwrap: Respect the ouput channel encoding format, #236 (thanks @martin308)
• [FEATURE] DogstatsD: Add beta support for sending global distribution metrics, #249