8.6.1

Tweak colourised console colours, thanks @haf
Xml summary can cause exception. #296 thanks @AnthonyLloyd
isFasterThan improve use of warm up runs. thanks @AnthonyLloyd
taskTask is missing my stack trace. #295 thanks @AnthonyLloyd
taskTask doesnt surface Task as valid do target. #293 thanks @AnthonyLloyd