Update all xcconfigs to use Swift 4.

Author: nlutsenko

Configurations/BoltsSwift-iOS.xcconfig

@@ -16,6 +16,6 @@ PRODUCT_BUNDLE_IDENTIFIER = com.bolts.swift.ios
 
 IPHONEOS_DEPLOYMENT_TARGET = 8.0
 
-SWIFT_VERSION = 3.0
+SWIFT_VERSION = 4.0
 
 INFOPLIST_FILE = $(SRCROOT)/Sources/Info.plist

Configurations/BoltsSwift-macOS.xcconfig

@@ -16,6 +16,6 @@ PRODUCT_BUNDLE_IDENTIFIER = com.bolts.swift.macos
 
 MACOSX_DEPLOYMENT_TARGET = 10.10
 
-SWIFT_VERSION = 3.0
+SWIFT_VERSION = 4.0
 
 INFOPLIST_FILE = $(SRCROOT)/Sources/Info.plist

Configurations/BoltsSwift-tvOS.xcconfig

@@ -14,6 +14,6 @@
 PRODUCT_NAME = BoltsSwift
 PRODUCT_BUNDLE_IDENTIFIER = com.bolts.swift.tvos
 
-SWIFT_VERSION = 3.0
+SWIFT_VERSION = 4.0
 
 INFOPLIST_FILE = $(SRCROOT)/Sources/Info.plist

Configurations/BoltsSwift-watchOS.xcconfig

@@ -14,6 +14,6 @@
 PRODUCT_NAME = BoltsSwift
 PRODUCT_BUNDLE_IDENTIFIER = com.bolts.swift.watchos
 
-SWIFT_VERSION = 3.0
+SWIFT_VERSION = 4.0
 
 INFOPLIST_FILE = $(SRCROOT)/Sources/Info.plist

Configurations/BoltsSwiftTests-iOS.xcconfig

@@ -15,6 +15,6 @@ PRODUCT_BUNDLE_IDENTIFIER = com.bolts.swift.ios.tests
 
 IPHONEOS_DEPLOYMENT_TARGET = 8.0
 
-SWIFT_VERSION = 3.0
+SWIFT_VERSION = 4.0
 
 INFOPLIST_FILE = $(SRCROOT)/Tests/Info.plist

Configurations/BoltsSwiftTests-macOS.xcconfig

@@ -15,6 +15,6 @@ PRODUCT_BUNDLE_IDENTIFIER = com.bolts.swift.macos.tests
 
 MACOSX_DEPLOYMENT_TARGET = 10.10
 
-SWIFT_VERSION = 3.0
+SWIFT_VERSION = 4.0
 
 INFOPLIST_FILE = $(SRCROOT)/Tests/Info.plist

Configurations/BoltsSwiftTests-tvOS.xcconfig

@@ -13,6 +13,6 @@
 PRODUCT_NAME = BoltsSwiftTests
 PRODUCT_BUNDLE_IDENTIFIER = com.bolts.swift.tvos.tests
 
-SWIFT_VERSION = 3.0
+SWIFT_VERSION = 4.0
 
 INFOPLIST_FILE = $(SRCROOT)/Tests/Info.plist