Adds archetypes to the set of permitted tokens.

Author: simonbrowndotje

structurizr-dsl/src/main/java/com/structurizr/dsl/ModelDslContext.java

@@ -24,6 +24,7 @@ public ElementGroup getGroup() {
     @Override
     protected String[] getPermittedTokens() {
         return new String[] {
+                StructurizrDslTokens.ARCHETYPES_TOKEN,
                 StructurizrDslTokens.IDENTIFIERS_TOKEN,
                 StructurizrDslTokens.GROUP_TOKEN,
                 StructurizrDslTokens.PERSON_TOKEN,