change request parameter key 'body' to 'bodyData'

[huynq2007]

some Api does have body as a query parameters.
It' better to change request body data to bodyData
#64

[gene1wood]

I'm reluctant to solve this this way because

• It just moves the problem from a name collision with body to bodyData that, though is likely to occur less frequently (based on the assumption that APIs in the world use the term body more frequently than bodyData), isn't really a fix
• uses non PEP008 camel case variable names
• would be backwards incompatible. This would break all existing uses of the library that pass a body argument to methods.

The problem with the body name collision is a design problem with agithub and we likely need to fix at a fundamental level.

I can imagine doing this either with a backwards incompatible design change that leaves support for legacy deployments or a configuration to enable a user to set the name of the body variable in their code to avoid collisions.