Fix pubspec repository for shelf_web_socket (#233)

diff --git a/pkgs/shelf_web_socket/pubspec.yaml b/pkgs/shelf_web_socket/pubspec.yaml
index ebb6f82..c3397c2 100644
--- a/pkgs/shelf_web_socket/pubspec.yaml
+++ b/pkgs/shelf_web_socket/pubspec.yaml
@@ -3,7 +3,7 @@
 
 description: >-
   A shelf handler that wires up a listener for every connection.
-repository: https://github.com/dart-lang/shelf/tree/master/shelf_web_socket
+repository: https://github.com/dart-lang/shelf/tree/master/pkgs/shelf_web_socket
 
 environment:
   sdk: ">=2.14.0 <3.0.0"