Updated to Swift 4.2

Zip.podspec

@@ -10,7 +10,7 @@ Pod::Spec.new do |s|
   s.name             = "Zip"
   s.version          = "1.1.0"
   s.summary          = "Zip and unzip files in Swift."
-  s.swift_version    = "4.1"
+  s.swift_version    = "4.2"
 
 # This description is used to generate tags and improve search results.
 #   * Think: What does it do? Why did you write it? What is the focus?
@@ -34,8 +34,6 @@ Pod::Spec.new do |s|
   s.osx.deployment_target = '10.9'
   s.requires_arc = true
 
-  s.pod_target_xcconfig = { 'SWIFT_VERSION' => '4.0' }
-
   s.source_files = 'Zip/*.{swift,h}', 'Zip/minizip/*.{c,h}', 'Zip/minizip/aes/*.{c,h}'
   s.public_header_files = 'Zip/*.h'
   s.pod_target_xcconfig = {'SWIFT_INCLUDE_PATHS' => '$(SRCROOT)/Zip/Zip/minizip/**','LIBRARY_SEARCH_PATHS' => '$(SRCROOT)/Zip/Zip/'}

Zip.xcodeproj/project.pbxproj

@@ -684,7 +684,7 @@
 				ONLY_ACTIVE_ARCH = YES;
 				SDKROOT = iphoneos;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
-				SWIFT_VERSION = 4.0;
+				SWIFT_VERSION = 4.2;
 				TARGETED_DEVICE_FAMILY = "1,2";
 				VERSIONING_SYSTEM = "apple-generic";
 				VERSION_INFO_PREFIX = "";
@@ -737,7 +737,7 @@
 				MTL_ENABLE_DEBUG_INFO = NO;
 				SDKROOT = iphoneos;
 				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
-				SWIFT_VERSION = 4.0;
+				SWIFT_VERSION = 4.2;
 				TARGETED_DEVICE_FAMILY = "1,2";
 				VALIDATE_PRODUCT = YES;
 				VERSIONING_SYSTEM = "apple-generic";