book.toml: add "optional" key to linkcheck.

ericonr · ericonr · commit f469bc8ff315 · 2020-07-24T18:12:36.000-03:00
Doesn't error out if it can't find the mdbook-linkcheck executable.
diff --git a/book.toml b/book.toml
@@ -8,5 +8,6 @@ title = "Void Linux Handbook"
 theme = "src/theme"
 
 [output.linkcheck]
+optional = true
 follow-web-links = true
 exclude = [ "kernel.org", "ntp.org", "\\.onion", "localhost", "hushan.tech" ]
