Update Xcode to 13.3

CHANGELOG.md

@@ -9,6 +9,7 @@ Change Log
 
 - Update Swift syntax style to add keywords added in Swift 5.6.
 - [trivial] Improve syntax highlighting indicator.
+- [dev] Update the build environment to Xcode 13.3 (Swift 5.6).
 
 
 ### Fixes

CotEditor/Syntaxes/Swift.yaml

@@ -160,6 +160,7 @@ types:
 - beginString: "Character"
 - beginString: "ClosedInterval"
 - beginString: "Codable"
+- beginString: "CodingKey"
 - beginString: "CodingKeyRepresentable"
 - beginString: "CollectionOfOne"
 - beginString: "CollectionType"
@@ -344,7 +345,6 @@ strings:
 - beginString: "##\""
   endString: "\"##"
 keywords:
-- beginString: "_"
 - beginString: "#available"
 - beginString: "#colorLiteral"
 - beginString: "#column"
@@ -362,6 +362,7 @@ keywords:
 - beginString: "#line"
 - beginString: "#selector"
 - beginString: "#sourceLocation"
+- beginString: "#unavailable"
 - beginString: "#warning"
 - beginString: "any"
 - beginString: "as"

README.md

@@ -24,8 +24,8 @@ CotEditor is a pure document-based Cocoa application written in Swift.
 ### Development Environment
 
 - macOS 12 Monterey
-- Xcode 13.2
-- Swift 5.5
+- Xcode 13.3
+- Swift 5.6
 - Sandbox enabled