v2.16.0

• Bump minimum Go version to 1.19
• Rename Response.ContentType/ContentEncoding/TransferEncoding to HasXxx (#252)
• Add Request.WithReporter and WithAssertionHandler (#234)
• Add stacktrace printing support (#160)
• Colorize JSON values (#334)
• Colorize HTTP requests and responses (#343)
• Prevent panic if flag.Parse hasn't been called (#410)
• Refactor and cleanup tests
• Improve test coverage
• Improve documentation
• Improve CI