Update book submodule to pass linkchecker test

This commit is contained in:
Kornel 2018-04-22 21:11:15 +01:00
parent f6a833a99a
commit 1912f39e7c

@ -1 +1 @@
Subproject commit b889e1e30c5e9953834aa9fa6c982bb28df46ac9
Subproject commit 6237a75790cd2e0ca22961b55f64a83319e73464