update node modules

node_modules/har-validator/lib/async.js

@@ -4,14 +4,21 @@ var schemas = require('har-schema')
 
 var ajv
 
+function createAjvInstance () {
+  var ajv = new Ajv({
+    allErrors: true
+  })
+  ajv.addMetaSchema(require('ajv/lib/refs/json-schema-draft-06.json'))
+  ajv.addSchema(schemas)
+
+  return ajv
+}
+
 function validate (name, data, next) {
   data = data || {}
 
   // validator config
-  ajv = ajv || new Ajv({
-    allErrors: true,
-    schemas: schemas
-  })
+  ajv = ajv || createAjvInstance()
 
   var validate = ajv.getSchema(name + '.json')