Generation of exercise READMEs by configlet is not idempotent #161
Description
From the instruction to regenerate exercise READMEs, it seems to me that the following
bin/configlet generate .
should be an idempotent operation. However, this is not the case, and many exercise READMEs will be changed upon running this command on the current state of this repo.
This means that if we are creating a new exercise, we have to always run
bin/configlet generate . --only <stub>
which is ok but defeat the purpose of the simpler version.