Remove dynamic require call

Fix #16

Author: simonepri

lib/get.js

@@ -12,19 +12,24 @@ var platformToMethod = {
   aix: 'ps',
 };
 
+var methodToRequireFn = {
+  ps: () => require('./ps'),
+  wmic: () => require('./wmic'),
+};
+
 var platform = os.platform();
 if (platform.startsWith('win')) {
   platform = 'win';
 }
 
-var file = platformToMethod[platform];
+var method = platformToMethod[platform];
 
 /**
  * Gets the list of all the pids of the system.
  * @param  {Function} callback Called when the list is ready.
  */
 function get(callback) {
-  if (file === undefined) {
+  if (method === undefined) {
     callback(
       new Error(
         os.platform() +
@@ -33,7 +38,7 @@ function get(callback) {
     );
   }
 
-  var list = require('./' + file);
+  var list = methodToRequireFn[method]();
   list(callback);
 }