Sugesstion by @awlx and reference to 2.11 tag

Author: chdxD1

README.md

@@ -6,7 +6,7 @@ go-netbox
 Package `netbox` provides an API 3.0 client for [netbox-community's NetBox](https://github.com/netbox-community/netbox)
 IPAM and DCIM service.
 
-This package assumes you are using NetBox 3.0, as the NetBox 1.0 API no longer exists. However NetBox 2.0 might still work as the API isn't that different between 2.0 and 3.0.
+This package assumes you are using NetBox 3.0, as the NetBox 1.0 API no longer exists. It wasn't tested on NetBox 2.0 but given the minor changes to the API between 2.0 and 3.0 it still might work. If you need Netbox 2.0 support (e.g. for 2.11) you can still `go get github.com/netbox-community/go-netbox@netbox_v2.11`.
 
 Using the client
 ================