only pass rounding option to serializer of standalone (#593)

Author: Uzlopak

lib/standalone.js

@@ -25,19 +25,18 @@ function buildStandaloneCode (options, validator, isValidatorUsed, contextFuncti
     buildAjvCode = fs.readFileSync(path.join(__dirname, 'validator.js')).toString()
     buildAjvCode = buildAjvCode.replace("'use strict'", '').replace('module.exports = SchemaValidator', '')
   }
+
+  const serializerOptions = options && options.rounding ? JSON.stringify({ options: options.rounding }) : ''
   return `
   'use strict'
-
   ${serializerCode.replace("'use strict'", '').replace('module.exports = ', '')}
   ${buildAjvCode}
-
-  const serializer = new Serializer(${JSON.stringify(options || {})})
+  const serializer = new Serializer(${serializerOptions})
   ${ajvSchemasCode}
 
   ${contextFunctionCode.replace('return main', '')}
 
-  module.exports = main
-      `
+  module.exports = main`
 }
 
 module.exports = buildStandaloneCode