* Update header value format to be "Chrome parsable"

[PikachuEXE]

Fixes #5

I understand that the format updated format is not what's specified in W3C draft

But it works:

Middleware=11241.11 ,ActiveRecord=54.18 ,Router=472.69 ,Controller=51.4 ,Redis=49.86 ,View=16536.12 ,Total=28405.39

Until the spec is finalized, I think we should use a format that Chrome can parse now

[itsderek23]

Thanks much @PikachuEXE. Based on the additional information provided in the comment thread on #5, I've instead added a note to the README on Chrome 64 support. See 9a10c2e.