Update README.md

Author: willcrichton

README.md

@@ -22,6 +22,8 @@ Flowistry can be helpful when you're reading a function with a lot of code. For
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+The algorithm that powers Flowistry was published in the paper ["Modular Information Flow through Ownership"](https://cel.cs.brown.edu/paper/modular-information-flow-ownership/) at PLDI 2022.
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 **Table of contents**
 * [Installation](#installation)
     * [IDE plugin](#ide-plugin)