Bump github.com/onevcat/rainbow from 3.1.5 to 4.2.1 - #409

Sourced from github.com/onevcat/rainbow's releases.

4.2.1

Fixed

• Optimized Entry.plainText concatenation for better performance. (#86)

4.2.0

Added

• High-performance StyledStringBuilder API for efficient string chaining (#78)
• HSL (Hue, Saturation, Lightness) color support with RGB conversion (#80)
• Strikethrough style support with ANSI escape sequences (#82)
• Conditional styling feature allowing styles based on conditions (#81)
• Batch operations API for better performance when applying multiple styles (#78)
• Comprehensive performance testing framework (#78)
• Performance optimization guide documentation (#78)

Fixed

• Memory efficiency improvements in StringGenerator (#78)
• Performance optimizations for chained style operations (#78)
• Improved test coverage with comprehensive edge case tests (#79)

4.1.0

Added

• Support FORCE_COLOR environment to enable color in a nested env. #76

Fixed

• Now the environment value checking requires non-zero and non-empty value to represent "set" status.
• Modernize the project to follow the Xcode settings in current days.

4.0.1

Fixed

• Now every segment would reset its style to prevent it spreading unexpected. #62

4.0.0

Added

• ANSI 256-color support. Use .bit8 or .onBit8 to apply a 256-color to a string. #49
• Hex colors approximation support. Use .hex or .onHex to apply an 8-bit color as the Hex color approximated to a string. #56
• Add support for colorizing nested strings. #51
• Add the light version of background named colors. #50
• Add the strikethrough style. #55
• Support color conversion between text color and its corresponding background color. Vice verse. #54

Remove

• The Xcode Color console output target is removed. It does not make sense anymore unless there is a new way to log color strings to the Xcode console.

... (truncated)

• cdf146a Bump version to 4.2.1
• e4e393b Prepare changelog and release tooling
• 1e2c89f Merge pull request #85 from onevcat/dependabot/bundler/aws-sdk-s3-1.208.0
• 40e38c8 Merge pull request #86 from onevcat/perf-optimize-plaintext
• 9f1c7a9 Optimize Entry.plainText concatenation
• 1c2dd8f Bump aws-sdk-s3 from 1.194.0 to 1.208.0
• dcabc6a Update README with demo
• 481f3eb Add rainbow ASCII art hero banner to demo
• 11f15a1 Add comprehensive demo showcasing all Rainbow features
• 40ba60c Merge pull request #83 from onevcat/dependabot/bundler/rexml-3.4.2
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