doc: add release notes as discussed in
@@ -91,6 +91,7 @@ We added even more functionality, which could not make it to the highlights:
## Other News
+- We added a tutorial about securing the integrity and confidentiality of configuration values.
- Peter Nirschl finished his [thesis](https://www.libelektra.org/ftp/elektra/publications/nirschl2018cryptographic.pdf)
([signature](https://www.libelektra.org/ftp/elektra/publications/nirschl2018cryptographic.pdf.sig)).
It includes a benchmark of different cryptographic providers.
