Change links to pub.dev

@@ -4,7 +4,7 @@
 
 This set of plugin allows Flutter apps to generate and print pdf files to device printer. This plugin works for iOS and Android.
 
-- dart pdf: <https://pub.dartlang.org/packages/pdf>
-- flutter printing: <https://pub.dartlang.org/packages/printing>
+* dart pdf: <https://pub.dev/packages/pdf>
+* flutter printing: <https://pub.dev/packages/printing>
 
 [![Buy Me A Coffee](https://bmc-cdn.nyc3.digitaloceanspaces.com/BMC-button-images/custom_images/orange_img.png "Buy Me A Coffee")](https://www.buymeacoffee.com/JORBmbw9h "Buy Me A Coffee")

@@ -10,7 +10,7 @@ images and text using TrueType fonts. With the ease of use you already know.
 
 <img alt="Example document" src="https://raw.githubusercontent.com/DavBfr/dart_pdf/master/pdf/example.jpg">
 
-Use the `printing` package <https://pub.dartlang.org/packages/printing>
+Use the `printing` package <https://pub.dev/packages/printing>
 for full flutter print and share operation.
 
 The coordinate system is using the internal Pdf unit:
@@ -34,7 +34,7 @@ pdf.addPage(Page(
       })); // Page
 ```
 
-To load an image it is possible to use the dart library [image](https://pub.dartlang.org/packages/image):
+To load an image it is possible to use the dart library [image](https://pub.dev/packages/image):
 
 ```dart
 final img = decodeImage(File('test.webp').readAsBytesSync());
@@ -71,7 +71,7 @@ pdf.addPage(Page(
 To save the pdf file:
 
 ```dart
-// On Flutter, use the [path_provider](https://pub.dartlang.org/packages/path_provider) library:
+// On Flutter, use the [path_provider](https://pub.dev/packages/path_provider) library:
 //   final output = await getTemporaryDirectory();
 //   final file = File("${output.path}/example.pdf");
 final file = File("example.pdf");

@@ -7,8 +7,8 @@ See the example on how to use the plugin.
 
 <img alt="Example document" src="https://raw.githubusercontent.com/DavBfr/dart_pdf/master/printing/example.png" width="300">
 
-This plugin uses the `pdf` package <https://pub.dartlang.org/packages/pdf>
-for pdf creation. Please refer to <https://pub.dartlang.org/documentation/pdf/latest/>
+This plugin uses the `pdf` package <https://pub.dev/packages/pdf>
+for pdf creation. Please refer to <https://pub.dev/documentation/pdf/latest/>
 for documentation.
 
 [![Buy Me A Coffee](https://bmc-cdn.nyc3.digitaloceanspaces.com/BMC-button-images/custom_images/orange_img.png "Buy Me A Coffee")](https://www.buymeacoffee.com/JORBmbw9h "Buy Me A Coffee")
@@ -55,7 +55,7 @@ pdf.addPage(Page(
     })); // Page
 ```
 
-To save the pdf file using the [path_provider](https://pub.dartlang.org/packages/path_provider) library:
+To save the pdf file using the [path_provider](https://pub.dev/packages/path_provider) library:
 
 ```dart
 final output = await getTemporaryDirectory();