Updated README.md

[ghost]

Hi,

I couldn't find any contribution guidelines, so I hope this is okay. While reading through the README.md, I noticed that the section which mentions the 'receive' api call references two identifiers, 'qwrqwrqwr' and 'owqkrokwr'. Based on what I read, I believe 'owqkrokwr' should be passed to the 'receive' method call 'key' parameter.

I may have completely misunderstood how constellation works, if that is the case, please ignore this and sorry for wasting your time.

[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.

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