Use Swift 4.2.

Author: objecthub

NumberKit.xcodeproj/project.pbxproj

@@ -324,7 +324,7 @@
 				SDKROOT = macosx;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
 				SWIFT_SWIFT3_OBJC_INFERENCE = Off;
-				SWIFT_VERSION = 4.0;
+				SWIFT_VERSION = 4.2;
 				VERSIONING_SYSTEM = "apple-generic";
 				VERSION_INFO_PREFIX = "";
 			};
@@ -375,7 +375,7 @@
 				SDKROOT = macosx;
 				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
 				SWIFT_SWIFT3_OBJC_INFERENCE = Off;
-				SWIFT_VERSION = 4.0;
+				SWIFT_VERSION = 4.2;
 				VERSIONING_SYSTEM = "apple-generic";
 				VERSION_INFO_PREFIX = "";
 			};
@@ -399,7 +399,7 @@
 				SKIP_INSTALL = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
 				SWIFT_SWIFT3_OBJC_INFERENCE = Off;
-				SWIFT_VERSION = 4.0;
+				SWIFT_VERSION = 4.2;
 			};
 			name = Debug;
 		};
@@ -420,7 +420,7 @@
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SKIP_INSTALL = YES;
 				SWIFT_SWIFT3_OBJC_INFERENCE = Off;
-				SWIFT_VERSION = 4.0;
+				SWIFT_VERSION = 4.2;
 			};
 			name = Release;
 		};
@@ -433,7 +433,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = net.objecthub.NumberKitTests;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_SWIFT3_OBJC_INFERENCE = Off;
-				SWIFT_VERSION = 4.0;
+				SWIFT_VERSION = 4.2;
 			};
 			name = Debug;
 		};
@@ -446,7 +446,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = net.objecthub.NumberKitTests;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_SWIFT3_OBJC_INFERENCE = Off;
-				SWIFT_VERSION = 4.0;
+				SWIFT_VERSION = 4.2;
 			};
 			name = Release;
 		};

README.md

@@ -2,8 +2,8 @@
 
 <p>
 <a href="https://developer.apple.com/osx/"><img src="https://img.shields.io/badge/Platform-macOS-blue.svg?style=flat" alt="Platform: macOS" /></a>
-<a href="https://developer.apple.com/swift/"><img src="https://img.shields.io/badge/Language-Swift%204.1-green.svg?style=flat" alt="Language: Swift 4.1" /></a>
-<a href="https://developer.apple.com/xcode/"><img src="https://img.shields.io/badge/IDE-Xcode%209.3-orange.svg?style=flat" alt="IDE: Xcode 9.3" /></a>
+<a href="https://developer.apple.com/swift/"><img src="https://img.shields.io/badge/Language-Swift%204.2-green.svg?style=flat" alt="Language: Swift 4.2" /></a>
+<a href="https://developer.apple.com/xcode/"><img src="https://img.shields.io/badge/IDE-Xcode%2010.0-orange.svg?style=flat" alt="IDE: Xcode 10.0" /></a>
 <a href="https://raw.githubusercontent.com/objecthub/swift-lispkit/master/LICENSE"><img src="http://img.shields.io/badge/License-Apache-lightgrey.svg?style=flat" alt="License: Apache" /></a>
 </p>
 
@@ -17,8 +17,8 @@ language. The current version provides three new numeric types:
   3. `Complex`: complex floating-point numbers
 
 **Requirements**:
-   - Xcode 9.3
-   - Swift 4.1
+   - Xcode 10.0
+   - Swift 4.2
    - macOS with Xcode or Swift Package Manager
    - Linux with Swift Package Manager