Fix the source file location for SwiftPM

Closes #20
Fixes #19

Defaults.podspec

@@ -7,7 +7,7 @@ Pod::Spec.new do |s|
 	s.social_media_url = 'https://twitter.com/sindresorhus'
 	s.authors = { 'Sindre Sorhus' => 'sindresorhus@gmail.com' }
 	s.source = { :git => 'https://github.com/sindresorhus/Defaults.git', :tag => "v#{s.version}" }
-	s.source_files = 'Sources/*.swift'
+	s.source_files = 'Sources/**/*.swift'
 	s.swift_version = '5.0'
 	s.macos.deployment_target = '10.12'
 	s.ios.deployment_target = '10.0'

Defaults.xcodeproj/project.pbxproj

@@ -160,9 +160,7 @@
 		8933C7811EB5B7E0000D00A4 /* Sources */ = {
 			isa = PBXGroup;
 			children = (
-				8933C7841EB5B820000D00A4 /* Defaults.swift */,
-				E3EB3E34216507AE0033B089 /* Observation.swift */,
-				E3EB3E32216505920033B089 /* util.swift */,
+				E30E93D822E9425E00530C8F /* Defaults */,
 			);
 			path = Sources;
 			sourceTree = "<group>";
@@ -192,6 +190,16 @@
 			name = Tests;
 			sourceTree = "<group>";
 		};
+		E30E93D822E9425E00530C8F /* Defaults */ = {
+			isa = PBXGroup;
+			children = (
+				8933C7841EB5B820000D00A4 /* Defaults.swift */,
+				E3EB3E34216507AE0033B089 /* Observation.swift */,
+				E3EB3E32216505920033B089 /* util.swift */,
+			);
+			path = Defaults;
+			sourceTree = "<group>";
+		};
 /* End PBXGroup section */
 
 /* Begin PBXHeadersBuildPhase section */

Tests/DefaultsTests/DefaultsTests.swift

@@ -17,7 +17,7 @@ extension Defaults.Keys {
 	static let key = Key<Bool>("key", default: false)
 	static let url = Key<URL>("url", default: fixtureURL)
 	static let `enum` = Key<FixtureEnum>("enum", default: .oneHour)
-	static let data = Key<Data>("data", default: Data(bytes: []))
+	static let data = Key<Data>("data", default: Data([]))
 	static let date = Key<Date>("date", default: fixtureDate)
 }
 
@@ -88,9 +88,9 @@ final class DefaultsTests: XCTestCase {
 	}
 
 	func testDataType() {
-		XCTAssertEqual(defaults[.data], Data(bytes: []))
+		XCTAssertEqual(defaults[.data], Data([]))
 
-		let newData = Data(bytes: [0xFF])
+		let newData = Data([0xFF])
 		defaults[.data] = newData
 		XCTAssertEqual(defaults[.data], newData)
 	}