Nests FormDataProvider under MultipartFormData.

Sources/Moya/MultipartFormData.swift

@@ -3,6 +3,14 @@ import Alamofire
 
 /// Represents "multipart/form-data" for an upload.
 public struct MultipartFormData: Hashable {
+
+    /// Method to provide the form data.
+    public enum FormDataProvider: Hashable {
+        case data(Foundation.Data)
+        case file(URL)
+        case stream(InputStream, UInt64)
+    }
+
     /// `FileManager` to use for file operations, if needed. `FileManager.default` by default.
     public let fileManager: FileManager
 
@@ -28,22 +36,15 @@ extension MultipartFormData: ExpressibleByArrayLiteral {
 /// Represents the body part of "multipart/form-data" for an upload.
 public struct MultipartFormBodyPart: Hashable {
 
-    /// Method to provide the form data.
-    public enum FormDataProvider: Hashable {
-        case data(Foundation.Data)
-        case file(URL)
-        case stream(InputStream, UInt64)
-    }
-
-    public init(provider: FormDataProvider, name: String, fileName: String? = nil, mimeType: String? = nil) {
+    public init(provider: MultipartFormData.FormDataProvider, name: String, fileName: String? = nil, mimeType: String? = nil) {
         self.provider = provider
         self.name = name
         self.fileName = fileName
         self.mimeType = mimeType
     }
 
     /// The method being used for providing form data.
-    public let provider: FormDataProvider
+    public let provider: MultipartFormData.FormDataProvider
 
     /// The name.
     public let name: String