Update README.md

README.md

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 This is the extracted Macaroon token code we use for authorization inside of Fly.io. Because [flyctl](https://github.com/superfly/flyctl), our CLI, is open source, it can't fully exploit our tokens unless this library is open source as well. So it is.
 
-We don't think you should use any of this code; it's shrink-wrapped around some peculiar details of our production network, and the data model is Fly-specific. But if it's an interesting to read, that's great too.
+We don't think you should use any of this code; it's shrink-wrapped around some peculiar details of our production network, and the data model is Fly-specific. But if it's an interesting read, that's great too.