[Reducer] Look for already processed multidimentional value and push the data instead of assigning a new one in body params

[SamvelRaja]

Issue:
If the body param has the values

[
  {"name": "key", "value": "value"},
  {"name": "foo", "value": "bar1"},
  {"name": "foo", "value": "bar2"},
  {"name": "foo", "value": "bar3"}
]

The reducer function were generating it as,

{
  "key": "value",
  "foo": [["bar1", "bar2"], "bar3"]
}

On passing the above value to qs module results in key=value&foo=&foo=bar3

This fix ensure we are not blindly adding the query params into the array (results in nested array)

hence, the out put of reducer function would be

{
  "key" : "value",
  "foo": ["bar1", "bar2", "bar3"]
} 

on passing to qs returns key=value&foo=bar1&foo=bar2&foo=bar3 which was the desired value.

P.S: Feel free to comment or reject the PR.

[SamvelRaja]

Build is already failing in master, hence it is also in the PR

[ahmadnassri]

thanks! i'll review the build and see why it's failing

[SamvelRaja]

Ping

[darrenjennings]

Looks good to me, thanks @SamvelRaja! Will probably bundle a few small fixes like this into a next single release.