libsecp256k1 0.6.0

Pure Rust secp256k1 implementation.
Documentation 
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# SECP256K1 implementation in pure Rust

* [Cargo](https://crates.io/crates/libsecp256k1)
* [Documentation](https://docs.rs/libsecp256k1)

SECP256K1 implementation with `no_std` support. Currently we have implementation for:

* Convert a private key to a public key.
* Sign messages.
* Signature verification.
* Public key recovery from signed messages.
* Shared secrets.

## Feature flags

* `std`: If disabled, works in `no_std` environment. Enabled by default.
* `hmac`: Add certain features that requires the HMAC-DRBG. This includes
  signing. Enabled by default.
* `static-context`: To speed up computation, the library uses a pre-computed
  table context for many `ecmult` operations. This feature flag puts the context
  directly as static variables. If disabled, the context must be created from
  heap manually. Increases binary size, enabled by default.
* `lazy-static-context`: Instead of storing the pre-computed table context as
  static variables, store it as a variable that dynamically allocates the
  context in heap via `lazy_static`. Only one of `static-context` and
  `lazy-static-context` can be enabled, or both disabled. Impact bootstrap
  performance, disabled by default.

## Development workflow

### Branch

This repository uses `develop` branch for development. Changes are periodically
merged to `master` branch.

### Pull request

All changes (except new releases) are handled through pull requests. Please open
your PR against `develop` branch.

### Versioning

Frontier follows [Semantic Versioning](https://semver.org/). An unreleased crate
in the repository will have the `-dev` suffix in the end, and we do rolling
releases.

When you make a pull request against this repository, please also update the
affected crates' versions, using the following rules. Note that the rules should
be applied recursively -- if a change modifies any upper crate's dependency
(even just the `Cargo.toml` file), then the upper crate will also need to apply
those rules.

Additionally, if your change is notable, then you should also modify the
corresponding `CHANGELOG.md` file, in the "Unreleased" section.

If the affected crate already has `-dev` suffix:

* If your change is a patch, then you do not have to update any versions.
* If your change introduces a new feature, please check if the local version
  already had its minor version bumped, if not, bump it.
* If your change modifies the current interface, please check if the local
  version already had its major version bumped, if not, bump it.

If the affected crate does not yet have `-dev` suffix:

* If your change is a patch, then bump the patch version, and add `-dev` suffix.
* If your change introduces a new feature, then bump the minor version, and add
  `-dev` suffix.
* If your change modifies the current interface, then bump the major version,
  and add `-dev` suffix.

If your pull request introduces a new crate, please set its version to
`1.0.0-dev`.