Update to Swift 5

Author: lucdion

.travis.yml

@@ -1,5 +1,5 @@
 language: objective-c
-osx_image: xcode10
+osx_image: xcode12
 
 before_install:
   - gem install xcpretty-travis-formatter;

LayoutFrameworkBenchmark.xcodeproj/project.pbxproj

@@ -489,7 +489,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = com.layoutbox.LayoutFrameworkBenchmark;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				PROVISIONING_PROFILE_SPECIFIER = "";
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
 			};
 			name = Debug;
 		};
@@ -507,7 +507,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = com.layoutbox.LayoutFrameworkBenchmark;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				PROVISIONING_PROFILE_SPECIFIER = "";
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
 			};
 			name = Release;
 		};