Bump the docs version

Author: bbatsov

doc/antora.yml

@@ -2,6 +2,6 @@ name: cider
 title: CIDER
 # We always provide version without patch here (e.g. 1.1),
 # as patch versions should not appear in the docs.
-version: ~
+version: 1.18
 nav:
 - modules/ROOT/nav.adoc