Merge pull request #2 from llvm-swift/bump

Update to Swift 4.1

Author: CodaFi

.swift-version

@@ -1 +1 @@
-4.0
+4.1

.travis.yml

@@ -5,7 +5,7 @@ matrix:
   include:
     - os: osx
       language: objective-c
-      osx_image: xcode9
+      osx_image: xcode9.3
       before_install:
         - gem install xcpretty
       script:

Sources/LiteSupport/TestRunner.swift

@@ -10,15 +10,6 @@ import Rainbow
 import ShellOut
 import Dispatch
 
-#if os(Linux)
-/// HACK: This is needed because on macOS, ObjCBool is a distinct type
-///       from Bool. On Linux, however, it is a typealias.
-extension ObjCBool {
-  /// Converts the ObjCBool value to a Swift Bool.
-  var boolValue: Bool { return self }
-}
-#endif
-
 /// Specifies how to parallelize test runs.
 public enum ParallelismLevel {
   /// Parallelize over an explicit number of cores.