chore(pubspec): fix publish warnings

Author: hourliert

pubspec.yaml

@@ -1,15 +1,15 @@
 name: graphql_client
-description: A starting point for Dart libraries or applications.
+description: A GraphQL client.
 version: 0.0.1
-#homepage: https://www.example.com
-#author: thomashourlier <email@example.com>
+homepage: https://github.com/hourliert/graphql_client
+author: Thomas Hourlier <hourliert@gmail.com>
 
 environment:
   sdk: '>=1.20.1 <2.0.0'
 
 dependencies:
   http: ^0.11.3
+  logging: ^0.11.3
 
 dev_dependencies:
   test: ^0.12.0
-  logging: ^0.11.3