message: fix casper-types build when compiled with std feature
diff: @@ -64,7 +64,7 @@ untrusted = "0.7.1"
  [features]
  json-schema = ["once_cell", "schemars"]
  -std = ["derp", "getrandom", "humantime", "once_cell", "pem", "thiserror", "untrusted"]
  +std = ["derp", "getrandom/std", "humantime", "once_cell", "pem", "thiserror", "untrusted"]
  testing = ["proptest", "rand_pcg"]
  # DEPRECATED - use "testing" instead of "gens".
  gens = ["testing"]
  