update img & repo url

RevokeMsgPatcher/FormMain.cs

@@ -113,5 +113,10 @@ namespace RevokeMsgPatcher
             }
             btnRestore.Enabled = File.Exists(patcher.BakPath);
         }
+
+        private void linkLabel1_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
+        {
+            System.Diagnostics.Process.Start("https://github.com/huiyadanli/RevokeMsgPatcher");
+        }
     }
 }