added requirements, updating upgrade docs

README.md

@@ -13,6 +13,12 @@ Version: 2.7.0 | [Changelog](CHANGELOG.md) | [Issues](https://github.com/bigblue
 - Full IPv6 support
 - Runs on any major linux distributon (Debian, Ubuntu, CentOS,...)
 
+## Requirements
+- 4GB of RAM
+- Linux (it will not work under WSL)
+- Root access (bbb-docker uses host networking, so it won't work with Kubernetes, any "CaaS"-Service, etc.)
+- Public IPv4 (expect issues with a firewall / NAT)
+
 ## What is not implemented yet
 - bbb-lti
 

docs/upgrading.md

@@ -1,7 +1,7 @@
 # How To Upgrade bbb-docker
 
 
-### Upgrading `v2.5.x` -> `v2.6.x`
+### Upgrading from `v2.5.x`
 
 - *Breaking change:* Greenlight got fully rewritten
     * it is starting as a fresh installation. you can migrate your data with `./scripts/greenlight-migrate-v2-v3`
@@ -10,7 +10,7 @@
 
 apart from that follow the guide below.
 
-### within `v2.6.x`
+### from `v2.6.x` or within `v2.7.x`
 #### Backup
 if you use greenlight, create a database backup first
 ```bash