Update documentation

Author: sdeleuze

README.adoc

@@ -1,9 +1,9 @@
-:version: 0.8.3
+:version: 0.8.4
 :repository: milestone
-:boot-version: 2.4.0
+:boot-version: 2.4.1
 :graalvm-version: 20.3.0
 :graalvm-dev-version: 20.3.0
-:boot-dev-version: 2.4.0
+:boot-dev-version: 2.4.1
 :documentation-url: https://repo.spring.io/{repository}/org/springframework/experimental/spring-graalvm-native-docs/{version}/spring-graalvm-native-docs-{version}.zip!
 
 image:https://ci.spring.io/api/v1/teams/spring-graalvm-native/pipelines/spring-graalvm-native/badge["Build Status", link="https://ci.spring.io/teams/spring-graalvm-native/pipelines/spring-graalvm-native"] image:https://img.shields.io/badge/{version}-documentation-blue.svg["{version} documentation", link="{documentation-url}/reference/index.html"]

spring-graalvm-native-docs/src/main/asciidoc/index.adoc

@@ -6,7 +6,7 @@
 :project-home: https://github.com/spring-projects-experimental/spring-graalvm-native
 :version: 0.8.4-SNAPSHOT
 :repository: milestone
-:boot-version: 2.4.0
+:boot-version: 2.4.1
 :cloud-version: 2020.0.0-RC1
 :graalvm-version: 20.3.0
 = Spring Native for GraalVM documentation