cleanup

fix version string for update check

Release T-Pot 20.06.0

# Release Notes

## Upgrade from 19.03.x
- If you are running T-Pot 19.x you can upgrade to T-Pot 20.06.0 by running `/opt/tpot/update.sh`. Please be aware upgrades can break things, so please backup all of your data or take snapshot of your machine **before** you run the update procedure.
- To protect possible changes of your Kibana objects you need to manually [export](https://github.com/dtag-dev-sec/tpotce/wiki/Import---Export-Kibana-Objects) (backup) your objects and manually [import](https://github.com/dtag-dev-sec/tpotce/wiki/Import---Export-Kibana-Objects) (overwrite) the provided T-Pot Kibana Objects after upgrading.

## Changelog
- **Release T-Pot 20.06.0**
  - After 4 months of public testing with the NextGen edition T-Pot 20.06 can finally be released.
- **Debian Buster**
  - With the release of Debian Buster T-Pot now has access to all packages required right out of the box.
- **Add new honeypots**
  - [Dicompot](https://github.com/nsmfoo/dicompot) by @nsmfoo is a low interaction honeypot for the Dicom protocol which is the international standard to process medical imaging information. Together with Medpot which supports the HL7 protocol T-Pot is now offering a Medical Installation type.
  - [Honeysap](https://github.com/SecureAuthCorp/HoneySAP) by SecureAuthCorp is a low interaction honeypot for the SAP services, in case of T-Pot configured for the SAP router.
  - [Elasticpot](https://gitlab.com/bontchev/elasticpot) by Vesselin Bontchev replaces ElasticpotPY as a low interaction honeypot for Elasticsearch with more features, plugins and scripted responses.
- **Rebuild Images**
  - All docker images were rebuilt based on the latest (and stable running) versions of the tools and honeypots. Mostly the images now run on Alpine 3.12 / Debian Buster. However some honeypots / tools still reuire Alpine 3.11 / 3.10 to run properly.
- **Install Types**
  - All docker-compose files (`/opt/tpot/etc/compose`) were remixed and most of the NextGen honeypots are now available in Standard.
  - There is now a **Medical** Installation Type with Dicompot and Medpot which will be of most interest for medical institutions to get started with T-Pot.
- **Update Tools**
  - Connecting to T-Pot via `https://<ip>:64297` brings you to the T-Pot Landing Page now which is based on Heimdall and the latest NGINX enforcing TLS 1.3.
  - The ELK stack was updated to 7.8.0 and stripped down to the necessary core functions (where possible) for T-Pot while keeping ELK RAM requirements to a minimum (8GB of RAM is recommended now). The number of index pattern fields was reduced to **697** which increases performance significantly. There are **22** Kibana Dashboards, **397** Kibana Visualizations and **24** Kibana Searches readily available to cover all your needs to get started and familiar with T-Pot.
  - Cyberchef was updated to 9.21.0.
  - Elasticsearch Head was updated to the latest version available on GitHub.
  - Spiderfoot was updated to latest 3.1 dev.
- **Landing Page**
  - After logging into T-Pot via web you are now greeted with a beautifully designed landing page.
- **Countless Tweaks and improvements**
  - Under the hood lots of tiny tweaks, improvements and a few bugfixes will increase your overall experience with T-Pot.

Update README.md

final prep for buster

Merge pull request telekom-security#329 from dtag-dev-sec/debian

Prepare for T-Pot 19.03 release

update docs

Update update.sh

rename edition

Include video