Update docs

Author: mdmintz

README.md

@@ -336,6 +336,12 @@ If you wish to use a proxy server for your browser tests (Chrome and Firefox onl
 pytest proxy_test.py --proxy=IP_ADDRESS:PORT
 ```
 
+If the proxy server that you wish to use requires authentication, you can do the following (Chrome only):
+
+```
+pytest proxy_test.py --proxy=USERNAME:PASSWORD@IP_ADDRESS:PORT
+```
+
 To make things easier, you can add your frequently-used proxies to PROXY_LIST in [proxy_list.py](https://github.com/seleniumbase/SeleniumBase/blob/master/seleniumbase/config/proxy_list.py), and then use ``--proxy=KEY_FROM_PROXY_LIST`` to use the IP_ADDRESS:PORT of that key.
 
 ```

help_docs/customizing_test_runs.md

@@ -36,6 +36,8 @@ pytest my_test_suite.py --server=IP_ADDRESS --port=4444
 
 pytest my_test_suite.py --proxy=IP_ADDRESS:PORT
 
+pytest my_test_suite.py --proxy=USERNAME:PASSWORD@IP_ADDRESS:PORT
+
 pytest test_fail.py -s --pdb --pdb-failures
 ```
 

help_docs/features_list.md

@@ -11,6 +11,7 @@
 * Uses a [global config file](https://github.com/seleniumbase/SeleniumBase/blob/master/seleniumbase/config/settings.py) for configuring SeleniumBase to your specific needs.
 * Backwards-compatible with [WebDriver](http://www.seleniumhq.org/projects/webdriver/). (Use ``self.driver`` anywhere.)
 * Can run tests through a proxy server. (Use ``--proxy=IP_ADDRESS:PORT``)
+* Can use an authenticated proxy server. (``--proxy=USERNAME:PASSWORD@IP_ADDRESS:PORT``)
 * Can handle Google Authenticator logins by using the [Python one-time password library](https://pyotp.readthedocs.io/en/latest/).
 * Includes a hybrid-automation solution called **[MasterQA](https://github.com/seleniumbase/SeleniumBase/blob/master/seleniumbase/masterqa/ReadMe.md)** to speed up manual testing.
 * Includes integrations with [MySQL](https://github.com/seleniumbase/SeleniumBase/blob/master/seleniumbase/core/testcase_manager.py), [Selenium Grid](https://github.com/seleniumbase/SeleniumBase/tree/master/seleniumbase/utilities/selenium_grid), [Google Cloud](https://github.com/seleniumbase/SeleniumBase/tree/master/integrations/google_cloud/ReadMe.md), [Amazon S3](https://github.com/seleniumbase/SeleniumBase/blob/master/seleniumbase/plugins/s3_logging_plugin.py), and [NodeJS](https://github.com/seleniumbase/SeleniumBase/tree/master/integrations/node_js).