Update a ReadMe

Author: mdmintz

help_docs/how_it_works.md

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 ### ![http://seleniumbase.com](https://cdn2.hubspot.net/hubfs/100006/images/super_logo_tiny.png "SeleniumBase") **How SeleniumBase Works:**
 
-At the core, SeleniumBase works by extending [Pytest](https://docs.pytest.org/en/latest/) and [Nosetests](http://nose.readthedocs.io/en/latest/) as a direct plugin to each one. This plugin is activated by using "``--with-selenium``", which is on by default with Pytest. When activated, Selenium-WebDriver automatically spins up web browsers for tests, and then gives those tests access to the SeleniumBase libraries through the BaseCase class, [found here](https://github.com/seleniumbase/SeleniumBase/blob/master/seleniumbase/fixtures/base_case.py). Now you can use "``--browser=chrome``" to specify the web browser to use (Default = "Chrome"). You can also include additional plugins for additional features such as "``--with-testing_base``" (for logging data/screenshots on test failures) and "``--demo_mode``" (for highlighting elements & slowing test runs). There are also other plugins available such as "``--with-db_reporting``", "``--with-s3_logging``", and more.
+At the core, SeleniumBase works by extending [Pytest](https://docs.pytest.org/en/latest/) and [Nosetests](http://nose.readthedocs.io/en/latest/) as a direct plugin to each one. SeleniumBase automatically spins up web browsers for tests, and then gives those tests access to the SeleniumBase libraries through the BaseCase class, [found here](https://github.com/seleniumbase/SeleniumBase/blob/master/seleniumbase/fixtures/base_case.py). Now you can use "``--browser=chrome``" to specify the web browser to use (Default = "Chrome"). You can also include additional plugins for additional features such as "``--demo_mode``" (for highlighting elements & changing the speed of test runs) and "``--proxy=IP_ADDRESS:PORT``" (for using a proxy server during test runs). There are also other plugins available such as "``--with-db_reporting``", "``--with-s3_logging``", and more.
 
 (NOTE: Pytest and Nosetests work by automatically running any Python method that starts with "``test``" from the file that you specified on the command line. You can also run all tests from a specific class in a file, or even pick out an individual test to run.)