doc: fix broken link to popper paper in README (#921)

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getpopper · Sep 17, 2020 · 3b0c40a · 3b0c40a
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diff --git a/README.md b/README.md
@@ -148,7 +148,7 @@ behavior, please immediately [email us](mailto:ivotron@ucsc.edu).
 > Distributed Processing Symposium Workshops (IPDPSW), 1561–70, 2017. 
 > (https://doi.org/10.1109/IPDPSW.2017.157)
 
-PDF for a pre-print version [available here](https://github.com/getpopper/popper-paper/raw/master/paper/paper.pdf). 
+PDF for a pre-print version [available here](https://raw.githubusercontent.com/systemslab/popper-paper/master/paper/paper.pdf). 
 For BibTeX, [click here](https://raw.githubusercontent.com/getpopper/popper-paper/master/popper.bib).
 
 [gfi]: https://github.com/getpopper/popper/issues?utf8=%E2%9C%93&q=is%3Aissue+label%3A%22good+first+issue%22+is%3Aopen