Update README.md

Author: thinkingserious

README.md

@@ -189,6 +189,8 @@ Please see [our helper](sendgrid/helpers/inbound) for utilizing our Inbound Pars
 <a name="announcements"></a>
 # Announcements
 
+Our Developer Experience team is conducting planned maintenance from 03/09/2021 until 03/11/2021. Our next release is scheduled for 03/15/2021.
+
 Please see our announcement regarding [breaking changes](https://github.com/sendgrid/sendgrid-python/issues/217). Your support is appreciated!
 
 All updates to this library are documented in our [CHANGELOG](CHANGELOG.md) and [releases](https://github.com/sendgrid/sendgrid-python/releases). You may also subscribe to email [release notifications](https://dx.sendgrid.com/newsletter/java) for releases and breaking changes.