changed order of Tanner's commits to see if it makes a difference with Travis CI (#61)

* Add travis change to xcode9

* Move to Swift 4

Author: twitterkb

.swift-version

@@ -1 +1 @@
-3.0
+4.0

.travis.yml

@@ -1,4 +1,4 @@
-osx_image: xcode8
+osx_image: xcode9
 language: objective-c
 script:
 # iOS Static Lib

ZipUtilities.xcodeproj/project.pbxproj

@@ -2483,7 +2483,7 @@
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_OBJC_BRIDGING_HEADER = "ZipUtilitiesTests/FrameworkTests-Bridging-Header.h";
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
-				SWIFT_VERSION = 3.0;
+				SWIFT_VERSION = 4.0;
 			};
 			name = Debug;
 		};
@@ -2499,7 +2499,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = "com.NSProgrammer.$(PRODUCT_NAME:rfc1034identifier)";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_OBJC_BRIDGING_HEADER = "ZipUtilitiesTests/FrameworkTests-Bridging-Header.h";
-				SWIFT_VERSION = 3.0;
+				SWIFT_VERSION = 4.0;
 			};
 			name = Release;
 		};
@@ -2577,7 +2577,7 @@
 				SDKROOT = macosx;
 				SWIFT_OBJC_BRIDGING_HEADER = "ZipUtilitiesTests/OSXFrameworkTests-Bridging-Header.h";
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
-				SWIFT_VERSION = 3.0;
+				SWIFT_VERSION = 4.0;
 			};
 			name = Debug;
 		};
@@ -2598,7 +2598,7 @@
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SDKROOT = macosx;
 				SWIFT_OBJC_BRIDGING_HEADER = "ZipUtilitiesTests/OSXFrameworkTests-Bridging-Header.h";
-				SWIFT_VERSION = 3.0;
+				SWIFT_VERSION = 4.0;
 			};
 			name = Release;
 		};