Update README.md

Author: MattKingDS

README.md

@@ -14,7 +14,7 @@
 
 - Java 1.7+
 
-## Usage
+## Note
 
 This open-source SDK is provided for cases where you would like to make additional changes that the SDK does not provide out-of-the-box. If you simply want to use the SDK with any of the examples shown in the [Developer Center](https://developers.docusign.com/esign-rest-api/code-examples), follow the installation instructions below.