Remove lodash when it's not required.

src/enrichment.js

@@ -2,7 +2,6 @@
 
 var assert   = require('assert');
 var resource = require('./resource');
-var _        = require('lodash');
 var Company  = require('./enrichment/company');
 var Person   = require('./enrichment/person');
 

src/enrichment/company.js

@@ -2,7 +2,6 @@
 
 var assert   = require('assert');
 var resource = require('../resource');
-var _        = require('lodash');
 
 exports.Company = resource.create('Company', {api: 'company', version: 2})
   .extend({

src/enrichment/person.js

@@ -2,7 +2,6 @@
 
 var assert   = require('assert');
 var resource = require('../resource');
-var _        = require('lodash');
 
 exports.Person = resource.create('Person', {api: 'person', version: 2})
   .extend({