Fix the repo link that appears in pub.dev

Author: richardmtaylor

pubspec.yaml

@@ -1,7 +1,7 @@
 name: approov_service_flutter_httpclient
 description: Approov enabled HttpClient
 version: 3.4.1
-repository: https://github.com/approov/approov_service_flutter_httpclient
+repository: https://github.com/approov/approov-service-flutter-httpclient
 homepage: https://pub.dev/publishers/approov.io/packages
 
 environment:
@@ -34,5 +34,3 @@ flutter:
         pluginClass: ApproovHttpClientPlugin
       ios:
         pluginClass: ApproovHttpClientPlugin
-
-