Bump asciidoctor-maven-plugin from 1.5.7 to 2.1.0 (#27)

Bumps [asciidoctor-maven-plugin](https://github.com/asciidoctor/asciidoctor-maven-plugin) from 1.5.7 to 2.1.0.
- [Release notes](https://github.com/asciidoctor/asciidoctor-maven-plugin/releases)
- [Changelog](https://github.com/asciidoctor/asciidoctor-maven-plugin/blob/master/CHANGELOG.adoc)
- [Commits](https://github.com/asciidoctor/asciidoctor-maven-plugin/compare/asciidoctor-maven-plugin-1.5.7...asciidoctor-maven-plugin-2.1.0)

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
diff --git a/pom.xml b/pom.xml
index f36302d..a722d47 100644
--- a/pom.xml
+++ b/pom.xml
@@ -321,7 +321,7 @@
                         <dependency>
                             <groupId>org.asciidoctor</groupId>
                             <artifactId>asciidoctor-maven-plugin</artifactId>
-                            <version>1.5.7</version>
+                            <version>2.1.0</version>
                         </dependency>
                     </dependencies>
                 </plugin>