Do not convert type-check-function into array

[Equals182]

Allows bodyparser.text to use your custom type-check-function and resolves #5

[fiznool]

Great catch - thank you for submitting this PR.

Can you add a test for this behaviour? I'll get it merged in once that is done.

[Equals182]

I guess Travis error on #19.1 build is not related to my pull request since its about some util.promisify compatibility with environment.

[Equals182]

By the way, do we really need additional checks for not being an array or function? It seems like bodyparser.text()'s code is already taking care of function case and the rest is on type-is.

Maybe it would be better to remove that if statement entirely and just copy type option's description from bodyparser changing json to xml?

I've tested it locally and all tests passed.
Not gonna add more commits here without discussion, but you can check out this branch if you want to: https://github.com/Equals182/body-parser-xml/tree/remove-type-checking-on-type-check-option

[fiznool]

Sorry for the late reply, this one slipped through the cracks.

I'm prepping for a v2.0 release of this lib and I'd love for this to be in place. I've taken a look at the branch you linked to and it looks great - if you could get this PR synced with the latest on master and updated with the code from that branch, I'd be happy to merge in.

Otherwise, I'll pull in the commits separately as I'd like to get this out soon.

[fiznool]

I've opened #13 to handle this.