bump target version to 11.0, update podspec

Locksmith.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name             = "Locksmith"
-  s.version          = "4.0.0"
+  s.version          = "5.1.0"
   s.summary          = "Locksmith is a powerful, protocol-oriented library for working with the keychain in Swift."
   s.description      = <<-DESC
                        Locksmith is a powerful, protocol-oriented library for working with the iOS, Mac OS X, watchOS, and tvOS keychain in Swift. It provides extensive support for a lot of different keychain requests, and extensively uses Swift-native concepts.
@@ -11,7 +11,7 @@ Pod::Spec.new do |s|
   s.source           = { :git => "https://github.com/matthewpalmer/Locksmith.git", :tag => s.version.to_s }
   s.social_media_url = 'https://twitter.com/_matthewpalmer'
 
-  s.ios.deployment_target = '8.0'
+  s.ios.deployment_target = '11.0'
   s.osx.deployment_target = '10.10'
   s.watchos.deployment_target = '2.0'
   s.tvos.deployment_target = '9.0'

Locksmith.xcodeproj/project.pbxproj

@@ -658,7 +658,7 @@
 				GCC_NO_COMMON_BLOCKS = YES;
 				INFOPLIST_FILE = Source/Info.plist;
 				INSTALL_PATH = "$(LOCAL_LIBRARY_DIR)/Frameworks";
-				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 11.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = "net.matthewpalmer.Locksmith-iOS";
 				PRODUCT_NAME = Locksmith;
@@ -680,7 +680,7 @@
 				GCC_NO_COMMON_BLOCKS = YES;
 				INFOPLIST_FILE = Source/Info.plist;
 				INSTALL_PATH = "$(LOCAL_LIBRARY_DIR)/Frameworks";
-				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 11.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = "net.matthewpalmer.Locksmith-iOS";
 				PRODUCT_NAME = Locksmith;