message: update rand and rand_xorshift
diff: @@ -24,8 +24,8 @@ exclude = [
  # argmin_testfunctions = { git = "https://github.com/argmin-rs/argmin-testfunctions.git", branch = "master"}
  argmin_core = "0.2.5"
  argmin_testfunctions = "0.1.1"
  -rand = { version = "0.6.5", features = ["serde1"] }
  -rand_xorshift = { version = "0.1.1", features = ["serde1"] }
  +rand = { version = "0.7.2", features = ["serde1"] }
  +rand_xorshift = { version = "0.2.0", features = ["serde1"] }
  serde = { version = "1.0", features = ["rc"] }
  approx = "0.3.2"
  