Update release metadata for 2.2.1 release

Author: abelsromero

CHANGELOG.adoc

@@ -13,6 +13,8 @@ For a detailed view of what has changed, refer to the {uri-repo}/commits/main[co
 
 == Unreleased
 
+== v2.2.1 (2021-07-24)
+
 Bug Fixes::
 
   * Fix excluding sources when enclosing parent path starts with _ (#544)

README.adoc

@@ -1,6 +1,6 @@
 = Asciidoctor Maven Plugin
 // Metadata
-:release-version: 2.2.0
+:release-version: 2.2.1
 :docs-version: 2.2
 :maven-site-plugin-version: 3.9.0
 // Settings

docs/antora.yml

@@ -1,16 +1,16 @@
 name: maven-tools
 title: Maven Tools
-version: '2.1'
+version: '2.2'
 asciidoc:
   attributes:
-    release-version: 2.1.0
+    release-version: 2.2.1
     maven-site-plugin-version: 3.9.0
     project-repo: asciidoctor/asciidoctor-maven-plugin
-    uri-asciidoc: http://asciidoc.org
-    uri-asciidoctor: http://asciidoctor.org
+    uri-asciidoc: https://asciidoc.org
+    uri-asciidoctor: https://asciidoctor.org
     uri-asciidoctorj: https://github.com/asciidoctor/asciidoctorj
     uri-examples: https://github.com/asciidoctor/asciidoctor-maven-examples
-    uri-maven: http://maven.apache.org
+    uri-maven: https://maven.apache.org
 nav:
 - modules/plugin/nav.adoc
 - modules/site-integration/nav.adoc