Hint in readme on how to change built target platform.

Depending on whats in the accept request header, the root
path either response with a plain text or some nice HTML.

it appears that order matters; using ctx.JSON overrides c.Type; but
instead of shuffling the lines around, the JSON string is generated
by *foot*, which allows to keep header setting at the beginning of
the function.

* add dependency to allow limiting possible values, though actual
  validation doesnt happen yet
* make variable that indicates health local instead of global

The three dots ('./...') are required to ensure recursive dependency
installation, meaning dependencies of sub-packages.

The three dots ('./...') are required to ensure recursive dependency
installation, meaning dependencies of sub-packages.