Make SubmissionsMiddleware ServiceType compliant to add middleware in config as the rest of vapor's available middleware (coding style more than a real improvement)

README.md

@@ -56,12 +56,13 @@ import Submissions
 try services.register(SubmissionsProvider())
 ```
 
-It also include a middleware you have to register in your `MiddlewareConfig` :
+It also includes a middleware you have to register in your `MiddlewareConfig`  (needs to come after `ErrorMiddleware` if present, to avoid the `SubmissionValidationError`s from being transformed into Internal Server errors on the way back up the responder chain)
 
 ```swift
 config.use(SubmissionsMiddleware.self)
 ```
 
+
 This makes sure that fields and errors can be stored on the request using a `FieldCache` service.
 
 

Sources/Submissions/SubmissionsMiddleware.swift

@@ -7,7 +7,7 @@ import Vapor
 /// up the responder chain.
 public final class SubmissionsMiddleware: Middleware, ServiceType {
 
-	/// See `ServiceType`.
+    /// See `ServiceType`.
 	public static func makeService(for container: Container) throws -> SubmissionsMiddleware {
 		return SubmissionsMiddleware()
 	}

Sources/Submissions/SubmissionsProvider.swift

@@ -8,6 +8,7 @@ public final class SubmissionsProvider: Provider {
 
     /// See `Provider`
     public func register(_ services: inout Services) throws {
+		services.register(SubmissionsMiddleware.self)
         services.register { _ in FieldCache() }
     }