Update README.md

Author: GrahamCampbell

README.md

@@ -295,3 +295,16 @@ License
 -------
 
 PHP dotenv is licensed under [The BSD 3-Clause License](LICENSE).
+
+
+---
+
+<div align="center">
+	<b>
+		<a href="https://tidelift.com/subscription/pkg/packagist-vlucas-phpdotenv?utm_source=packagist-vlucas-phpdotenv&utm_medium=referral&utm_campaign=readme">Get professional support for PHP dotenv with a Tidelift subscription</a>
+	</b>
+	<br>
+	<sub>
+		Tidelift helps make open source sustainable for maintainers while giving companies<br>assurances about security, maintenance, and licensing for their dependencies.
+	</sub>
+</div>