Added new field to schema

We added the new town property to the schema for downstream consumers.

// labeled-line-markers.jsx
{
  "type" : "record",
  "namespace" : "Tutorialspoint",
  "name" : "Employee",
  "fields" : [
     { "name" : "Name" , "type" : "string" },
     { "name" : "Age" , "type" : "int" },

     { "name" : "Town" , "type" : "string" },
  ]
}