simgrid 3.20 was tested

doc/doxygen/chapters/470_simgrid.doxy

@@ -19,7 +19,7 @@
 /*! \page SimGridSupport SimGrid Support
 
 StarPU can use Simgrid in order to simulate execution on an arbitrary
-platform. This was tested with simgrid from 3.11 to 3.16, and 3.18 to 3.19.
+platform. This was tested with simgrid from 3.11 to 3.16, and 3.18 to 3.20.
 Other versions may have compatibility issues. 3.17 notably does not build at
 all.