Merge pull request #64 from phpgt/add-jetbrains-sponsorship

Add JetBrains sponsorship to README with H1 heading

Author: g105b

README.md

@@ -34,3 +34,9 @@ $exampleDataSource->create(new Person(
 	age: 5,
 ));
 ```
+
+# Proudly sponsored by
+
+[JetBrains Open Source sponsorship program](https://www.jetbrains.com/community/opensource/)
+
+[![JetBrains logo.](https://resources.jetbrains.com/storage/products/company/brand/logos/jetbrains.svg)](https://www.jetbrains.com/community/opensource/)