[plugin_platform_interface] Fix homepage in pubspec.yaml (flutter#3088)

Fixes flutter/flutter#66844

Author: kevmoo

packages/plugin_platform_interface/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 1.0.3
+
+* Fix homepage in `pubspec.yaml`.
+
 ## 1.0.2
 
 * Make the pedantic dev_dependency explicit.

packages/plugin_platform_interface/pubspec.yaml

@@ -12,9 +12,9 @@ description: Reusable base class for Flutter plugin platform interfaces.
 # be done when absolutely necessary and after the ecosystem has already migrated to 1.X.Y version
 # that is forward compatible with 2.0.0 (ideally the ecosystem have migrated to depend on:
 # `plugin_platform_interface: >=1.X.Y <3.0.0`).
-version: 1.0.2
+version: 1.0.3
 
-homepage: https://github.com/flutter/plugins/plugin_platform_interface
+repository: https://github.com/flutter/plugins/tree/master/packages/plugin_platform_interface
 
 environment:
   sdk: ">=2.1.0 <3.0.0"