Set Antora to prerelease on master

Author: CodeDrivenMitch

docs/reference/antora.yml

@@ -3,7 +3,7 @@ title: MongoDB Extension Reference
 version:
   axon-mongo-(?<version>+({0..9}).+({0..9})).*: $<version>
   master: development
-prerelease: false
+prerelease: true
 start_page: ROOT:index.adoc
 
 asciidoc: