message: Update minimal versions to fix build.
diff: @@ -30,6 +30,9 @@ rand_os = "0.1"
  rand_xoshiro = "0.1"
  rand_core = { version = "0.3", default-features = false }
  rayon = "1.0.3"
  +# These are needed for the minimal-versions build
  +rayon-core = ">=1.4.1"
  +libc = ">=0.1.5"
  [dev-dependencies]
  tempdir = "0.3.7"
  