Spelling Error in README.rst

[rasheedmhd]

This is what is written in the first paragraph of the README.rst

"Now knockpy supports queries to VirusTotal subdomains, you can setting the API_KEY within the config.json file"

But I believe that it was supposed to be this way...

"Now knockpy supports queries to VirusTotal subdomains, you can set the API_KEY within the config.json file."

To correct that, you can simply copy the correction I made, and paste it into the README.rst replacing the wrong spelling.