message: Update examples/caliper/README
diff: @@ -12,7 +12,7 @@ use of MFEM features based on the Caliper performance profiling library.
  To build these examples, make sure that MFEM is configured with the option
  "MFEM_USE_CALIPER = YES", see the top-level INSTALL file for details (version
  -2.5.0 of Caliper is recommended, though older versions may work too.
  +2.5.0 of Caliper is recommended, though older versions may work too).
  We recommend comparing the original example codes with the corresponding files
  in the current directory.
  