Convert blueprint creation-date to string
There have been numerous times where a blueprint doc is merged without having the 'creation-date' value in quotes, and Nanoc failing to compile the doc in question.
Fix that by explicitly converting the 'creation-date' value into a string.
Related issues/MRs:
How to test
- Remove the quotes from the
creation-date
value in one of the blueprints. - Verify that Nanoc compiles successfully.
Edited by Achilleas Pipinellis