Cargo Features

bitcoin-private has no features set by default.

[dependencies]
bitcoin-private = { version = "0.1.0", features = ["std", "alloc"] }
std = alloc
alloc std?

Affects display::DisplayHex.to_lower_hex_string, display::DisplayHex.to_upper_hex_string, display::DisplayHex.to_hex_string, display::DisplayHex.append_hex_to_string