Solution:

• Improve the docs. PR Problem: Docs say install highest Tendermint version #2524 is a step, but the following may also imply changes in docs.
• Hard-wire the supported Tendermint version as a constant right in the code of BigchainDB Server. Check the version of Tendermint, if possible, when connecting to it, and respond appropriately: maybe give a helpful error, maybe disconnect, maybe quit?
• Add a new command-line command bigchaindb tendermint-version to get the supported version of Tendermint. Useful for scripts etc.