update changelog and revision for next development version (#131)

- update revision to 8.1.0
- add `Unreleased` changelog section

# Checklist

The following aspects have been respected by the author of this pull
request, confirmed by both pull request assignee **and** reviewer:

* Adherence to coding conventions
  * [x] Pull Request Assignee
  * [x] Reviewer
* Adherence to javadoc conventions
  * [x] Pull Request Assignee
  * [x] Reviewer
* Changelog update (necessity checked and entry added or not added
respectively)
  * [x] Pull Request Assignee
  * [x] Reviewer
* README update (necessity checked and entry added or not added
respectively)
  * [x] Pull Request Assignee
  * [x] Reviewer
* config update (necessity checked and entry added or not added
respectively)
  * [x] Pull Request Assignee
  * [x] Reviewer
* SDCcc executable ran against a test device (if necessary)
  * [x] Pull Request Assignee
  * [x] Reviewer

CHANGELOG.md

@@ -4,6 +4,8 @@ All notable changes to SDCcc will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [Unreleased]
+
 ## [8.0.1] - 2023-09-13
 
 ### Fixed

pom.xml

@@ -15,7 +15,7 @@
     </modules>
 
     <properties>
-        <revision>8.0.1</revision>
+        <revision>8.1.0</revision>
         <changelist>-SNAPSHOT</changelist>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <execPluginVersion>3.1.0</execPluginVersion>