Make unirest compatible to mime 2.* versions

[gayathridmallela]

This is to support the higer versoin of mime from 2.* .This fix is required to avoid the error of mandate true on the mine on the retries

To avoid the below error on retries callback

Error: Attempt to change mapping for "form" extension from "application/x-www-form-urlencoded" to "application/x-www-form-urlencoded". Pass force=true to allow this, otherwise remove "form" from the list of extensions for "application/x-www-form-urlencoded".
at Mime.define (/home/user/projects/mytest/node_modules/mime/Mime.js:32:17)

[crispinkoech]

Hey, any update on this? Facing this issue on one of our packages 😅 @nijikokun

[nijikokun]

Appears that one of the tests is failing, once resolved I can merge

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