rtk must pass through unrecognized commands

[fnando]

The instruction file states that if it doesn't have a dedicated filter, it passes commands through unchanged. That's not happening.

$ rtk make build-test-wasms

error: unrecognized subcommand 'make'

Usage: rtk [OPTIONS] <COMMAND>

For more information, try '--help'.

Another example:

$ rtk ruby --version

error: unrecognized subcommand 'ruby'

Usage: rtk [OPTIONS] <COMMAND>

For more information, try '--help'.