Update package metadata and README

- Bump package version to 1.0.3.
- Update Dart SDK constraint to ^3.8.0.
- Upgrade flutter_lints to ^6.0.0.
- Clarify marquee effect in README description.
- Reorder sections in README.

Author: pratikPSB

README.md

@@ -1,12 +1,6 @@
 # fading_marquee_widget
 
-This package I have made for apply the marquee effect for the very long widget.
-
-_Appreciate my work? Show some ❤️ and star the repo to support this package._
-
-### Here is the working video of this package
-
-<img src="https://github.com/pratikPSB/fading_marquee_widget/blob/master/fading_marquee_widget_demo.gif?raw=true" height="400"  alt="working demo of my package"/>
+This package I have made for apply the marquee (scrolling effect in one line) effect for the very long widget.
 
 ### Installation Guide
 
@@ -57,6 +51,10 @@ FadingMarqueeWidget(
    ),
 )
 ```
+_Appreciate my work? Show some ❤️ and star the repo to support this package._
+
+### Here is the working video of this package
+
+<img src="https://github.com/pratikPSB/fading_marquee_widget/blob/master/fading_marquee_widget_demo.gif?raw=true" height="400"  alt="working demo of my package"/>
 
-For more information about the properties, look at
-the [API reference](https://pub.dev/documentation/fading_marquee_widget/latest/).
+For more information about the properties, look at the [API reference](https://pub.dev/documentation/fading_marquee_widget/latest/).

pubspec.yaml

@@ -1,11 +1,10 @@
 name: fading_marquee_widget
 description: "A flutter package to apply the marquee effect for the very long widget."
-version: 1.0.2
+version: 1.0.3
 homepage: https://github.com/pratikPSB/fading_marquee_widget
 
 environment:
-  sdk: ^3.5.2
-  flutter: '>=3.3.0'
+  sdk: ^3.8.0
 
 dependencies:
   flutter:
@@ -16,7 +15,7 @@ dependencies:
 dev_dependencies:
   flutter_test:
     sdk: flutter
-  flutter_lints: ^4.0.0
+  flutter_lints: ^6.0.0
 
 # For information on the generic Dart part of this file, see the
 # following page: https://dart.dev/tools/pub/pubspec