update stackoverflow login README file

Signed-off-by: GuillaumeFalourd <[email protected]>
GuillaumeFalourd · Apr 6, 2021 · 141bcb9 · 141bcb9
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diff --git a/docs/img/rit-stackoverflow-login.png b/docs/img/rit-stackoverflow-login.png
diff --git a/stackoverflow/login/README.md b/stackoverflow/login/README.md
@@ -6,7 +6,10 @@
 - Google Chrome installed
 - The selenium driver for Google Chrome browser. 
 [You can download the latest from here](https://sites.google.com/a/chromium.org/chromedriver/downloads). After you unzip it, for convenience, on unix, you should place the chromedriver file under `/usr/local/bin/`
-- A SendGrid [API KEY](https://sendgrid.com/docs/ui/account-and-settings/api-keys/) and [EMAIL SENDER](https://sendgrid.com/docs/ui/sending-email/senders/). It's `FREE` until 100 emails sent / day.
+
+### Optional
+
+If you use SendGrid (it's `FREE` until 100 emails sent / day), you can inform [RIT_SENDGRID_API_KEY](https://sendgrid.com/docs/ui/account-and-settings/api-keys/) and [RIT_SENDGRID_EMAIL_SENDER](https://sendgrid.com/docs/ui/sending-email/senders/) as local variables to send an email when an error occurs.
 
 ## Command
 
@@ -22,7 +25,7 @@ This formula uses Selenium with a Chrome Driver to connect to your stackoverflow
 Visit the site each day for 100 consecutive days. (Days are counted in UTC.).
 ```
 
-If an error occured, the formula will send an EMAIL to the Stackoverflow user account using SendGrid.
+If an error occured, the formula will send an EMAIL to the Stackoverflow user account using SendGrid if the user inform the API KEY and the SENDER EMAIL as local variables.
 
 ## Demo