TokenAuthenticationMiddleware still throws an Abort (is not optional)

[andrewtheis]

In 2.0.0-RC.4, work was done to allow multiple authentication middlewares to exist for a route optionally. However, for TokenAuthenticationMiddleware the following line still throws an Abort:

auth/Sources/Authentication/Token/TokenAuthenticationMiddleware.swift

Line 17 in c8594a4

let token = try req.requireAuthenticated(A.TokenType.self)

This should be try? so TokenAuthenticationMiddleware works optionally as intended.