Add insertSpaceAfterOpeningAndBeforeClosingEmptyBraces to tsfmt

This setting currently isn't picked up properly (vvakame/typescript-formatter#166) but adding it for the future

tsfmt.json

@@ -10,7 +10,8 @@
 	"insertSpaceAfterOpeningAndBeforeClosingNonemptyParenthesis": false,
 	"insertSpaceAfterOpeningAndBeforeClosingNonemptyBrackets": false,
 	"insertSpaceAfterOpeningAndBeforeClosingTemplateStringBraces": false,
+	"insertSpaceAfterOpeningAndBeforeClosingEmptyBraces": true,
 	"insertSpaceBeforeFunctionParenthesis": false,
 	"placeOpenBraceOnNewLineForFunctions": false,
 	"placeOpenBraceOnNewLineForControlBlocks": false
-}
+}