Get Dispatch compiling on linux

explicitly importing Dispatch

Author: tettoffensive

Source/Shared/Storage/AsyncStorage.swift

@@ -1,4 +1,5 @@
 import Foundation
+import Dispatch
 
 /// Manipulate storage in a "all async" manner.
 /// The completion closure will be called when operation completes.

Source/Shared/Storage/AsyncStorageAware.swift

@@ -1,4 +1,5 @@
 import Foundation
+import Dispatch
 
 /// A protocol used for saving and loading from storage in async manner.
 public protocol AsyncStorageAware: class {

Source/Shared/Storage/Storage.swift

@@ -1,4 +1,5 @@
 import Foundation
+import Dispatch
 
 /// Manage storage. Use memory storage if specified.
 /// Synchronous by default. Use `async` for asynchronous operations.

Source/Shared/Storage/SyncStorage.swift

@@ -1,4 +1,5 @@
 import Foundation
+import Dispatch
 
 /// Manipulate storage in a "all sync" manner.
 /// Block the current queue until the operation completes.

Tests/iOS/Tests/Storage/AsyncStorageTests.swift

@@ -1,4 +1,5 @@
 import XCTest
+import Dispatch
 @testable import Cache
 
 final class AsyncStorageTests: XCTestCase {

Tests/iOS/Tests/Storage/SyncStorageTests.swift

@@ -1,4 +1,5 @@
 import XCTest
+import Dispatch
 @testable import Cache
 
 final class SyncStorageTests: XCTestCase {