Don't await browse.close task (#178)

Author: kblok

lib/PuppeteerSharp/Browser.cs

@@ -108,7 +108,13 @@ public async Task CloseAsync()
 
             IsClosed = true;
 
-            await _closeCallBack();
+            var closeTask = _closeCallBack();
+
+            if (closeTask != null)
+            {
+                await closeTask;
+            }
+
             Disconnect();
             Closed?.Invoke(this, new EventArgs());
         }

lib/PuppeteerSharp/Launcher.cs

@@ -195,7 +195,11 @@ public async Task<Browser> ConnectAsync(ConnectOptions options)
 
                 _connection = await Connection.Create(options.BrowserWSEndpoint, connectionDelay, keepAliveInterval);
 
-                return await Browser.CreateAsync(_connection, options, () => _connection.SendAsync("Browser.close", null));
+                return await Browser.CreateAsync(_connection, options, () =>
+                {
+                    var closeTask = _connection.SendAsync("Browser.close", null);
+                    return null;
+                });
             }
             catch (Exception ex)
             {