Update README.md

Words matter update

Author: PhilWakelin

README.md

@@ -21,7 +21,7 @@ For further details about the development of this sample refer to the tutorial [
 ## Downloading
 
 - Clone the repository using your IDEs support, such as the Eclipse Git plugin
-- **or**, download the sample as a [ZIP](https://github.com/cicsdev/cics-java-liberty-springboot-jcics/archive/master.zip) and unzip onto the workstation
+- **or**, download the sample as a [ZIP](https://github.com/cicsdev/cics-java-liberty-springboot-jcics/archive/main.zip) and unzip onto the workstation
 
 >*Tip: Eclipse Git provides an 'Import existing Projects' check-box when cloning a repository.*