Swift: Added some keyword (#2756)

components/prism-swift.js

@@ -16,7 +16,7 @@ Prism.languages.swift = Prism.languages.extend('clike', {
 			}
 		}
 	},
-	'keyword': /\b(?:as|associativity|break|case|catch|class|continue|convenience|default|defer|deinit|didSet|do|dynamic(?:Type)?|else|enum|extension|fallthrough|final|for|func|get|guard|if|import|in|infix|init|inout|internal|is|lazy|left|let|mutating|new|none|nonmutating|operator|optional|override|postfix|precedence|prefix|private|protocol|public|repeat|required|rethrows|return|right|safe|self|Self|set|static|struct|subscript|super|switch|throws?|try|Type|typealias|unowned|unsafe|var|weak|where|while|willSet|__(?:COLUMN__|FILE__|FUNCTION__|LINE__))\b/,
+	'keyword': /\b(?:as|associativity|break|case|catch|class|continue|convenience|default|defer|deinit|didSet|do|dynamic(?:Type)?|else|enum|extension|fallthrough|final|for|func|get|guard|if|import|in|infix|init|inout|internal|is|lazy|left|let|mutating|new|none|nonmutating|operator|optional|override|postfix|precedence|prefix|private|protocol|public|repeat|required|rethrows|return|right|safe|self|Self|set|some|static|struct|subscript|super|switch|throws?|try|Type|typealias|unowned|unsafe|var|weak|where|while|willSet|__(?:COLUMN__|FILE__|FUNCTION__|LINE__))\b/,
 	'number': /\b(?:[\d_]+(?:\.[\de_]+)?|0x[a-f0-9_]+(?:\.[a-f0-9p_]+)?|0b[01_]+|0o[0-7_]+)\b/i,
 	'constant': /\b(?:nil|[A-Z_]{2,}|k[A-Z][A-Za-z_]+)\b/,
 	'atrule': /@\b(?:IB(?:Outlet|Designable|Action|Inspectable)|class_protocol|exported|noreturn|NS(?:Copying|Managed)|objc|UIApplicationMain|auto_closure)\b/,

tests/languages/swift/keyword_feature.test

@@ -55,6 +55,7 @@ safe
 self
 Self
 set
+some
 static
 struct
 subscript
@@ -137,6 +138,7 @@ __LINE__
 	["keyword", "self"],
 	["keyword", "Self"],
 	["keyword", "set"],
+	["keyword", "some"],
 	["keyword", "static"],
 	["keyword", "struct"],
 	["keyword", "subscript"],