message: Move num-traits behind unstable feature flag
  It is only directly required for ssh-rsa support, which is currently
  unstable.
diff: @@ -49,7 +49,7 @@ bech32 = "0.7"
  # OpenSSH-specific dependencies:
  # - RSAES-OAEP from RFC 8017 with SHA-256 and MGF1 (behind unstable feature flag)
  -num-traits = "0.2"
  +num-traits = { version = "0.2", optional = true }
  rsa = { version = "0.2", git = "https://github.com/str4d/RSA", branch = "oaep", optional = true }
  # - Conversion of public keys from from Ed25519 to X25519
  @@ -108,7 +108,7 @@ default = ["cli"]
  cli-common = ["dialoguer", "dirs", "gumdrop", "log"]
  cli = ["cli-common", "chrono", "console", "env_logger", "minreq"]
  mount = ["cli-common", "env_logger", "fuse_mt", "libc", "tar", "time", "zip"]
  -unstable = ["rsa"]
  +unstable = ["num-traits", "rsa"]
  [[bin]]
  name = "rage-mount"
  