Keeping password out of nightwatch test specs

// tests/update-contact.js

auth_creds = require('./auth_creds.json');

module.exports = {
  
  setUp : function(browser) {
    browser
      .url("http://example.com")
      .waitForElementVisible("body", 1000)
      .setValue("#Username", auth_creds.username)
      .setValue("#Password", auth_creds.password)
      .click("#loginSubmit");
  },
  
  "Step 1" : function (browser) {},
  
  "Step 2" : function (browser) {}
};