Updated for 2.2.3 release

.travis.yml

@@ -1,6 +1,4 @@
 language: objective-c
-before_script:
-- brew update
-- brew upgrade xctool || true
-osx_image: xcode7.3
-script: xctool test -project Tests/UnitTests.xcodeproj -scheme UnitTests -sdk iphonesimulator
+osx_image: xcode9
+
+script: xcodebuild test -project Tests/UnitTests.xcodeproj -scheme UnitTests -destination 'platform=iOS Simulator,name=iPhone 8 Plus,OS=11.0'

AutoCoding.podspec.json

@@ -1,13 +1,13 @@
 {
   "name": "AutoCoding",
-  "version": "2.2.2",
+  "version": "2.2.3",
   "summary": "AutoCoding is a category on NSObject that provides automatic support for NSCoding to any object.",
   "homepage": "https://github.com/nicklockwood/AutoCoding",
   "license": "zlib",
   "authors": "Nick Lockwood",
   "source": {
     "git": "https://github.com/nicklockwood/AutoCoding.git",
-    "tag": "2.2.2"
+    "tag": "2.2.3"
   },
   "platforms": {
     "ios": "4.3",

AutoCoding/AutoCoding.h

@@ -1,7 +1,7 @@
 //
 //  AutoCoding.h
 //
-//  Version 2.2.2
+//  Version 2.2.3
 //
 //  Created by Nick Lockwood on 19/11/2011.
 //  Copyright (c) 2011 Charcoal Design
@@ -97,7 +97,7 @@ NS_ASSUME_NONNULL_BEGIN
  * being used to load it, an exception will be thrown (to avoid this, call the
  * method on `NSObject` instead of a specific subclass).
  */
-+ (instancetype)objectWithContentsOfFile:(NSString *)path;
++ (nullable instancetype)objectWithContentsOfFile:(NSString *)path;
 
 /**
  * Attempts to write the file to disk. This method is overridden by the

AutoCoding/AutoCoding.m

@@ -1,7 +1,7 @@
 //
 //  AutoCoding.m
 //
-//  Version 2.2.2
+//  Version 2.2.3
 //
 //  Created by Nick Lockwood on 19/11/2011.
 //  Copyright (c) 2011 Charcoal Design