Mailgun 5.0.0

⚠️Breaking changes⚠️
This release of mailgun allows a user to mock MailgunProvider for testing and also uses the correct EventLoop for Request

extension Application.Mailgun.Provider {
    static var fake: Self {
        .init {
            $0.mailgun.use { app, _ in
                MockMailgun(eventLoop: app.eventLoopGroup.next())
            }
        }
    }
}

This release also renames the package name and url to be more concise.
So now installing mailgun will look like

.package(url: "https://github.com/vapor-community/mailgun.git", from: "5.0.0")

.target(name: "App", dependencies: [
    .product(name: "Vapor", package: "vapor"),
    .product(name: "Mailgun", package: "mailgun")
])