Add open to keywords

keith · keith · commit 404df978f983 · 2018-04-20T11:37:48.000-07:00
diff --git a/syntax/swift.vim b/syntax/swift.vim
@@ -138,6 +138,7 @@ syntax keyword swiftKeywords
       \ mutating
       \ nil
       \ nonmutating
+      \ open
       \ operator
       \ optional
       \ override
