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Release version 2.2.1

This release fixes a security vulnerability in the account management
API. It is highly recommended to upgrade if you are using database
authentication.

Additional bug fixes:
* The `security.authentication.login-try-limit` setting now works as
  intended.

Release version 2.1.1

This release fixes a security vulnerability in the account management
API. It is highly recommended to upgrade if you are using database
authentication.

Additional changes:
* Libraries have been upgraded to fix potential bugs

Release version 2.0.3

This release fixes a security vulnerability in the account management
API. It is highly recommended to upgrade if you are using database
authentication.

Additional changes:
* Libraries have been upgraded to fix potential bugs
* Some unnecessary log warnings for Websocket communication are filtered

Release version 2.3.1

Bug fixes:
* Case-insensitive user IDs are now correctly handled for LDAP
  authentication.
* LDAP authentication does no longer request unnecessary user
  attributes.

Release version 2.3.0

Major features:
* Improved LDAP authentication support: Additional settings for LDAP
  search and a privileged LDAP user have been added.
* Usernames for admin accounts can now be set up in the configuration
  file. These accounts are privileged to create global "Messages of the
  Day". Additional privileges might be added for them in future
  releases.
* Splash screen settings have been added to override the frontend
  theme's defaults.
* The API has been extended to support features introduced with ARSnova
  Mobile 2.3.

Minor features and changes:
* Markdown formatting, learning progress, student's own questions and
  the question format flashcard are now active by default and can no
  longer be disabled for the whole ARSnova installation.

Bugfixes:
* The `security.authentication.login-try-limit` setting now works as
  intended.

Changes for developers:
* API documentation is now exposed in Swagger format.
* Startup time of Jetty has been significantly reduced.
* Version information is now saved with builds and exposed by the API.

**This version is brought to you by:**
Project management: Klaus Quibeldey-Cirkel
Lead programming: Andreas Gärtner, Daniel Gerhardt, Tom "tekay"
Käsler, Christoph Thelen
Contributions: Eduard Ellert, Tjark Wilhelm Hoeck, Mohamed Sami Jarmoud,
Stefan Schmeißer, Paul-Christian Volkmer

Release version 2.2.0

This release massively improves performance of ARSnova and contains a critical
bugfix so it is highly recommended to upgrade. Because of the newly introduced
caching method, it might be necessary to increase the Java memory limit for
servlet containers.

Major features:
* Performance improvements: Database queries are now cached by the backend.
  Answers are written to the database in batches.
* Pagination support: The range of results can now be limited.
* The API has been extended to support features introduced with ARSnova Mobile
  2.2.

Bugfixes:
* User content consisting of JSON could not be loaded and rendered connected
  data unloadable as well.

This version is brought to you by:
Project management: Klaus Quibeldey-Cirkel
Lead programming: Andreas Gärtner, Daniel Gerhardt, Christoph Thelen
Contributions: Dominik Hikade, Tom Käsler, Maximilian Klingelhöfer,
Michael Sann, Jan Sladek, Katharina Staden