Update Maven and Tomcat version requirements

Author: arey

readme.md

@@ -114,9 +114,9 @@ using the Maven profile "css", i.e. `./mvnw generate-resources -P css`.
 ### Prerequisites
 The following items should be installed in your system:
 * Java 17 or newer (full JDK not a JRE)
-* Maven 3.5+ (https://maven.apache.org/install.html)
+* Maven 3.8+ (https://maven.apache.org/install.html)
 * git command line tool (https://help.github.com/articles/set-up-git)
-* Jetty 11.0+ or Tomcat 10+
+* Jetty 11.0+ or Tomcat 11+
 * Your prefered IDE 
   * Eclipse with the m2e plugin. Note: when m2e is available, there is an m2 icon in Help -> About dialog. If m2e is not there, just follow the install process here: http://www.eclipse.org/m2e/
   * [Spring Tools Suite](https://spring.io/tools) (STS)