assertPublished dont working with custom exchange

[kauanslr]

Describe the bug When publishing message using the custom exchange Pigeon::exchange() the Pigeon::fake()->assertPublished() dont work

To Reproduce Steps to reproduce the behavior:

1. Create a publisher using custom exchange
2. Create a Test and set the fake behavior Pigeon::fake()
3. Use assertPublished and see error

Expected behavior I expect the assertPublished check if a message was published in a custom exchange

Environment (please complete the following information):

• Pigeon version: 1.0.0-alpha-1