added pageLoadStrategy on the cli

lib/cli/cli.js

@@ -158,6 +158,14 @@ module.exports.parseCommandLine = function parseCommandLine() {
         'Delay between runs, in milliseconds. Use it if your web server needs to rest between runs :)',
       group: 'Browser'
     })
+    .option('browsertime.pageLoadStrategy', {
+      alias: 'pageLoadStrategy',
+      choices: ['normal', 'none'],
+      default: 'none',
+      describe:
+        'The Page Load Strategy decides when you have control of the page load. Default is none meaning you will have control direct after navigation. That means that in a preTask that loads a page, you need to wait for the page to load.',
+      group: 'Browser'
+    })
     .option('browsertime.visualMetrics', {
       alias: ['visualMetrics', 'speedIndex'],
       type: 'boolean',