message: Fix libCEED's version requirement.
diff: @@ -575,7 +575,8 @@ The specific libraries and their options are:
  URL: https://libocca.org
  Options: OCCA_DIR, OCCA_OPT, OCCA_LIB.
  -- CEED, used when MFEM_USE_CEED = YES. Requires libCEED v0.5 or later.
  +- CEED, used when MFEM_USE_CEED = YES. Requires libCEED's master branch,
  + specifically, git-hash c360dbd or later.
  URL: https://github.com/CEED/libCEED
  https://ceed.exascaleproject.org/libceed
  Options: CEED_DIR, CEED_OPT, CEED_LIB.
  