Document required url parameter for generateScreenshots()

Closes gh-54
scottgonzalez · Jul 25, 2017 · 9aa2dda · 9aa2dda
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diff --git a/readme.md b/readme.md
@@ -360,6 +360,7 @@ Gets the list of available browsers.
 Creates a job to take screenshots.
 
 * `options`: A hash of settings for the screenshots. See [screenshot job objects](#screenshot-job-objects) for details.
+	* `url`: The URL of the desired page.
 	* `browsers`: A collection of [browser objects](#browser-objects) indicating which browsers and devices to take screenshots with.
 	* `win_res` (optional): Only required if taking a screenshot on Windows. Defaults to `"1024x768"`.
 	* `mac_res` (optional): Only required if taking a screenshot on Mac OS X. Defaults to "1024x768"`.