2.0.0

• Drop support for PHP 7.2 and 7.3
• Require guzzlehttp/guzzle ^8.0, guzzlehttp/promises ^3.0, and guzzlehttp/psr7 ^3.0
• Escape unsafe command names and previous messages in generated command exceptions
• Reject native PHP serialization of ServiceClient
• Require custom implementations and subclasses of public command APIs to match native method signatures
• Require service client response transformers to return ResultInterface values
• Require command collections to be iterable and reject single commands in executeAll() and executeAllAsync()
• Require custom middleware, transformers, and executeAll() callbacks to accept exact argument types instead of relying on scalar coercion
• Redact credential-bearing command and HTTP arguments from PHP 8.2+ backtraces
• Preserve requests from PSR-18 request and network exceptions and from Guzzle transfer exceptions when wrapping command failures
• Allow command exception constructors to accept any previous Throwable
• Add generic PHPDoc return types to asynchronous service client APIs
• Improve PHPDoc for command handler stacks, transformer callables, and concurrent command callbacks