bumped to version 3.1.0

[nixrajput]

Updated PR template.

• Adds/improves functionality for the carousel widget
• Fixes bugs or issues
• Adds new features like autoplay, infinite scrolling, etc.
• Optimizes performance or enhances accessibility

Checklist

Code Changes

• I have added new features to the carousel widget (e.g., autoplay, indicator customization, etc.)
• I have fixed existing issues (e.g., performance, edge cases)
• I have improved the overall structure or optimized the codebase

Documentation

• I have updated the README file or relevant documentation with the changes
• I have added code usage examples or updated existing examples to reflect changes
• I have updated the package version in the pubspec.yaml file

Testing

General Tests

• The carousel widget works correctly with default settings
• The carousel can handle a dynamic number of children (images, texts, etc.)
• The carousel supports custom widgets for carousel items

Autoplay Feature

• Autoplay starts when enabled and stops when disabled
• Autoplay pauses when the user interacts (swipes/taps) with the carousel
• Autoplay resumes after interaction

Indicators and Customization

• The carousel displays indicators correctly and updates when navigating through slides
• Custom indicators (colors, shapes, positions) are rendered correctly
• Custom animations or transitions between slides work as expected

Looping and Scrolling

• Infinite loop mode works smoothly without any jumps or glitches
• The carousel scrolls smoothly horizontally and/or vertically
• Pagination and snapping behavior works as expected

Accessibility

• The carousel widget supports screen readers (e.g., Semantics labels added)
• Users can navigate between items using a keyboard (if necessary)

Responsiveness

• The carousel adapts to different screen sizes (mobile, tablet, desktop)
• The carousel responds correctly to device orientation changes

Error Handling

• The carousel handles empty/null items gracefully
• The carousel handles large data sets without crashes or performance drops

Performance

• I ran performance tests to ensure no regressions
• The carousel renders efficiently, even with a large number of items

How did you verify your code works?

• I have written unit tests covering the new features
• I ran manual tests to check various carousel configurations (autoplay, infinite loop, custom widgets)
• I verified the carousel on different devices and screen sizes
• All tests pass locally (flutter test)