update vtkm version in readme and user guide

README.md

@@ -16,7 +16,7 @@ Documentation is hosted at [Read The Docs](https://fides.readthedocs.io/en/lates
 
 Fides depends of VTK-m and ADIOS2:
 
-- For VTK-m, we require any version equal or higher than 2.0.
+- For VTK-m, we require any version equal or higher than 2.1.
 - For ADIOS2, we recommend v2.8.0 or later. Run the unit tests if doubt arises.
 
 ## Testing

docs/user_guide/source/setting_up/setting_up.rst

@@ -10,7 +10,7 @@ Dependencies
 ************
 * `ADIOS2 <https://github.com/ornladios/ADIOS2>`_: Most recent release is preferred, but most ADIOS2 versions should be fine.
 
-* `VTK-m <https://gitlab.kitware.com/vtk/vtk-m>`_: Version 1.9 or later, with 2.0 or later being recommended.
+* `VTK-m <https://gitlab.kitware.com/vtk/vtk-m>`_: Version 2.1 or later.
 
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 Building, Testing, and Installing Fides