NervosSwift 0.18.1

[Change] Update matterinc/web3swift to 1.1.0.
[Feature] Add Utils module.

NervosSwift 0.18.0

[Change] Adapt CITA v0.18.

NervosSwift 0.17.2

[Fix] Transaction signing value serialization bug.
[Feature] Add new Address type.
[Refactor] Change some BigUInt type properties/parameters to UInts.

NervosSwift 0.17.1

For this release:

[Fix] Transaction signing address and value serialization bug.

NervosSwift Initial Release

v0.17.0 is the initial release of Swift SDK for Nervos AppChain.

It's compatible with CITA v0.17.

For this release:

• [Feature] Add HTTP provider for connecting to Nervos testnet or any AppChain network.
• [Feature] Implement Nervos AppChain JSON-RPC API over HTTP.
• [Feature] Provide a signer for signing a Nervos transaction.