updated dockerfile and README

Dockerfile

 FROM tomcat:9-jre8
 
 RUN rm -rf /usr/local/tomcat/webapps/*
-COPY build/2.3.0/BudgetMaster-v2.3.0.war $CATALINA_HOME/webapps/ROOT.war
+COPY build/2.3.1/BudgetMaster-v2.3.1.war $CATALINA_HOME/webapps/ROOT.war
 COPY src/main/resources/config/templates/settings-docker.properties /root/.Deadlocker/BudgetMaster/settings.properties
 
 EXPOSE 8080
\ No newline at end of file

README.md

@@ -2,7 +2,7 @@
 Manage your monthly budget easily with BudgetMaster
 
 - __start:__ 17.12.16
-- __current release:__ v2.3.0 (21) from 25.08.19
+- __current release:__ v2.3.1 (22) from 28.08.19
 
 ## Key Features
 - Keep your data private - Host your own BudgetMaster server or use it in standalone mode. All data remains on your machines.
@@ -15,6 +15,7 @@ Manage your monthly budget easily with BudgetMaster
 - Password protected website - Your data can only be accessed by entering the correct password. (Note: The database is not encrypted)
 - Localization - English and German supported.
 - Search and Filter - Search for individual transactions or filter your view.
+- Visualize your data - Use on of the pre-defined charts or create your one by using the chart framework to visualize and analyze your data.
 
 ## Available Languages
 - English [Roadmap](https://roadmaps.thecodelabs.de/roadmap/2)