fix unused data variable

Author: jeremydaly

lib/validateTypes.js

@@ -9,7 +9,7 @@
 const { toBool, hasValue, error } = require('./utils')
 
 // Performs type validation/coercian
-module.exports = (DocumentClient) => (mapping,field,value,data={}) => {
+module.exports = (DocumentClient) => (mapping,field,value) => {
 
   // Evaluate function expressions
   // TODO: should this happen here?