This is a simple, no-dependency library which implements utility functions
for working with big integers, hex encodings etc needed by Bitcoin. It
differs from other existing cragtes in the field in it's focus on
supporting the same versions of Rust compilers as bitcoin and
bitcoin_hashes crates and not using any external dependencies in order
to reduce potential attack surface.
This library should always compile with any combination of features on Rust 1.29.
Contributions are welcome, including additional hash function implementations.