[ffigen] Update pubspec.yaml (#332)

pkgs/ffigen/pubspec.yaml

diff --git a/pkgs/ffigen/pubspec.yaml b/pkgs/ffigen/pubspec.yaml
index 967ccdf..a9b443c 100644
--- a/pkgs/ffigen/pubspec.yaml
+++ b/pkgs/ffigen/pubspec.yaml
@@ -4,8 +4,8 @@
 
 name: ffigen
 version: 5.0.0-dev.1
-homepage: https://github.com/dart-lang/ffigen
 description: Generator for FFI bindings, using LibClang to parse C header files.
+repository: https://github.com/dart-lang/ffigen
 
 environment:
   sdk: '>=2.16.0-124.0.dev <3.0.0'