Add swift 4 support(convert xcodeproj file)

Author: NickRybalko

.swift-version

@@ -0,0 +1 @@
+4.0

WeakPointerArray.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name = 'WeakPointerArray'
-  s.version = '1.0'
+  s.version = '1.1'
   s.license = 'MIT'
   s.summary = 'The WeakPointerArray represents a mutable collection created over Array, but it holds weak references for objects(not strong as in Array).'
   s.homepage = 'https://github.com/NickRybalko/WeakPointerArray'

WeakPointerArray.xcodeproj/project.pbxproj

@@ -344,10 +344,12 @@
 				TargetAttributes = {
 					186795991F1F745200BE1068 = {
 						CreatedOnToolsVersion = 8.3.3;
+						LastSwiftMigration = 0900;
 						ProvisioningStyle = Automatic;
 					};
 					186795A11F1F745200BE1068 = {
 						CreatedOnToolsVersion = 8.3.3;
+						LastSwiftMigration = 0900;
 						ProvisioningStyle = Automatic;
 					};
 					1890D1901F1F574200D33D55 = {
@@ -540,7 +542,8 @@
 				PRODUCT_NAME = WeakPointerArray;
 				SDKROOT = appletvos;
 				SKIP_INSTALL = YES;
-				SWIFT_VERSION = 3.0;
+				SWIFT_SWIFT3_OBJC_INFERENCE = On;
+				SWIFT_VERSION = 4.0;
 				TARGETED_DEVICE_FAMILY = 3;
 				TVOS_DEPLOYMENT_TARGET = 9.0;
 			};
@@ -561,7 +564,8 @@
 				PRODUCT_NAME = WeakPointerArray;
 				SDKROOT = appletvos;
 				SKIP_INSTALL = YES;
-				SWIFT_VERSION = 3.0;
+				SWIFT_SWIFT3_OBJC_INFERENCE = On;
+				SWIFT_VERSION = 4.0;
 				TARGETED_DEVICE_FAMILY = 3;
 				TVOS_DEPLOYMENT_TARGET = 9.0;
 			};
@@ -576,7 +580,8 @@
 				PRODUCT_BUNDLE_IDENTIFIER = "com.NickRybalko.WeakPointerArray-tvOSTests";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SDKROOT = appletvos;
-				SWIFT_VERSION = 3.0;
+				SWIFT_SWIFT3_OBJC_INFERENCE = On;
+				SWIFT_VERSION = 4.0;
 				TVOS_DEPLOYMENT_TARGET = 10.2;
 			};
 			name = Debug;
@@ -590,7 +595,8 @@
 				PRODUCT_BUNDLE_IDENTIFIER = "com.NickRybalko.WeakPointerArray-tvOSTests";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SDKROOT = appletvos;
-				SWIFT_VERSION = 3.0;
+				SWIFT_SWIFT3_OBJC_INFERENCE = On;
+				SWIFT_VERSION = 4.0;
 				TVOS_DEPLOYMENT_TARGET = 10.2;
 			};
 			name = Release;