Update the link to std++

README.md

@@ -15,7 +15,7 @@ document is [available online](http://plv.mpi-sws.org/iris/appendix-3.1.pdf).
 This version is known to compile with:
 
  - Coq 8.7.1 / 8.7.2 / 8.8.0 / 8.8.1 / 8.8.2
- - A development version of [std++](https://gitlab.mpi-sws.org/robbertkrebbers/coq-stdpp)
+ - A development version of [std++](https://gitlab.mpi-sws.org/iris/stdpp)
 
 For a version compatible with Coq 8.6, have a look at the
 [iris-3.1 branch](https://gitlab.mpi-sws.org/FP/iris-coq/tree/iris-3.1).