Preparing release 6.4.0 (CLI version as well)

Author: bbottema

modules/cli-module/src/main/java/org/simplejavamail/internal/clisupport/CliCommandLineProducer.java

@@ -38,7 +38,7 @@ static CommandLine configurePicoCli(List<CliDeclaredOptionSpec> declaredOptions,
                         "%n" +
                         "Note: All the regular functionality regarding properties and config files work with the CLI so you can provide defaults in a " +
                         "property file as long as it is visible (on class path) or as system environment variables.")
-                .version("Simple Java Mail 6.3.2");
+                .version("Simple Java Mail 6.4.0");
 
         rootCommandsHolder.usageMessage()
                 .customSynopsis("",