Exclude Earlier 3.1 releases

From 3.1.0 to 3.1.4

Issue gh-869

Author: jzheaux

antora-playbook.yml

@@ -19,7 +19,7 @@ content:
     # Refname matching:
     # https://docs.antora.org/antora/latest/playbook/content-refname-matching/
     branches: [main,'({3..9}).+({0..9}).x', '!(3.0.x)']
-    tags: ['({3..9}).+({0..9}).+({0..9})?(-{RC,M}+({0..9}))', '!(3.0.+({0..9})?(-{RC,M}+({0..9})))']
+    tags: ['({3..9}).+({0..9}).+({0..9})?(-{RC,M}+({0..9}))', '!(3.0.+({0..9})?(-{RC,M}+({0..9})))', '!(3.1.+({0..4})?(-{RC,M}+({0..9})))']
 asciidoc:
   extensions:
     - '@asciidoctor/tabs'