Explain how to get revision for a specific tool version

[paulzierep]

Since one needs to know the revision of a specific tool for the yml-based request and this is not easy to get from the toolshed it would be good to add the information on how-to get it to the readme. This page helped me a lot: https://hexylena.galaxians.org/toolshed-version-database/

[cat-bro]

Good link!

Since one needs to know the revision of a specific tool for the yml-based request

If it's the latest version of the tool you do not need to add this

Needing the revision number is also true for adding a specific version of a tool on EU and Main, no?