docs: added topics in pubspec.yaml (#74)

Author: OutdatedGuy

pubspec.yaml

@@ -3,6 +3,13 @@ description: "A Blazingly Fast way to configure your awesome flutter project to
 version: 1.8.0
 homepage: https://outdatedguy.rocks
 repository: https://github.com/OutdatedGuy/package_rename
+topics:
+  - rename
+  - project-configuration
+  - configuration-updater
+  - package-rename
+funding:
+  - https://github.com/sponsors/OutdatedGuy
 
 environment:
   sdk: '>=2.12.0 <4.0.0'