updated readme/parameters are sent with the key :params

[JackMarx]

I noticed the documentation did not reflect the code and wanted to contribute to the README file. Thanks for the great tool!

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}