Conformed APIErrorMiddleware to Service and ServiceType protocols

Author: calebkleveter

README.md

@@ -26,7 +26,7 @@ However, if you are creating an API service and want all errors to be caught by
 You can register the middleware to the `MiddlewareConfig` using:
 
 ```swift
-middlewares.add(APIErrorMiddleware())
+middlewares.use(APIErrorMiddleware.self)
 ```
 
 Most likely, you will want to register this middleware first. This ensures that all the errors are caught and we don't have any thrown after its responder is run. There are some that you might want to run afterwards though, such as Vapor's built in `DateMiddleware`.

Sources/APIErrorMiddleware/APIErrorMiddleware.swift

@@ -7,14 +7,19 @@ import Foundation
 ///
 /// Errors with an identifier of `modelNotFound` get
 /// a 404 status code.
-public final class APIErrorMiddleware: Middleware {
+public final class APIErrorMiddleware: Middleware, Service, ServiceType {
 
     // We define an empty init because the one
     // synthesized bby Swift is marked `internal`.
 
     /// Create an instance if `APIErrorMiddleware`.
     public init() {}
 
+    /// Creates a service instance. Used by a `ServiceFactory`.
+    public static func makeService(for worker: Container) throws -> APIErrorMiddleware {
+        return APIErrorMiddleware()
+    }
+    
     /// Catch all errors thrown by the route handler or
     /// middleware futher down the responder chain and
     /// convert it to a JSON response.