2.15.2

Documentation:

• Document that no eagerCache makes recursive nesting undefined behavior. (a486b88)
• Fix typos in the documentation. (03a172a, ab3ad8d)

Contributed Software:

• Update contributions/book-templates. (contributed by @xvrabcov, 8c56288, 78af2fd, b238dbc)
• Update contributions/pandoc-to-markdown. (contributed by @drehak, 7cc7edc, 2e7ccfe)
• List @TeXhackse's document templates in contributions/README.md.

Continuous Integration:

• Fix a typo in Makefile that made it impossible to recover from pkgcheck errors. (33c8c99)