Update node version in README

Author: Dave Syer

README.adoc

@@ -30,9 +30,9 @@ Installing `npm` is fraught with issues, including but not limited to how to get
         <plugin>
             <groupId>com.github.eirslett</groupId>
             <artifactId>frontend-maven-plugin</artifactId>
-            <version>1.6</version>
+            <version>1.12.0</version>
             <configuration>
-                <nodeVersion>v9.11.2</nodeVersion>
+                <nodeVersion>v16.13.1</nodeVersion>
             </configuration>
             <executions>
                 <execution>