Remove research notice

README.md

@@ -17,16 +17,3 @@ Please see the [documentation](https://tskit.dev/msprime/docs/latest/) for
 more details, including
 [installation instructions](https://tskit.dev/msprime/docs/latest/installation.html).
 
-
-### Research notice
-Please note that this repository is participating in a study into sustainability
-of open source projects. Data will be gathered about this repository for
-approximately the next 12 months, starting from 2021-06-04.
-
-Data collected will include number of contributors, number of PRs, time taken to
-close/merge these PRs, and issues closed.
-
-For more information, please visit
-[our informational page](https://sustainable-open-science-and-software.github.io/)
-or download our
-[participant information sheet](https://sustainable-open-science-and-software.github.io/assets/PIS_sustainable_software.pdf).