message: Updates MFEM_USE_PUMI instructions in  INSTALL
diff: @@ -426,6 +426,8 @@ MFEM_USE_PUMI = YES/NO
  data management system that is capable of handling general non-manifold
  models and effectively supports automated adaptive analysis. PUMI enables
  support for parallel unstructured mesh modifications in MFEM.
  + The develop branch of PUMI repository (https://github.com/SCOREC/core)
  + should be used for most updated features.
  MFEM_USE_UMPIRE = YES/NO
  Enables support for Umpire, a resource management library that allows the
  @@ -609,6 +611,7 @@ The specific libraries and their options are:
  - PUMI (optional), used when MFEM_USE_PUMI = YES.
  URL: https://scorec.rpi.edu/pumi
  + https://github.com/SCOREC/core
  Options: PUMI_OPT, PUMI_LIB.
  Versions: PUMI >= 2.2.0.
  