Fix: Build

OskarStark · OskarStark · commit 3facbc530c0a · 2020-10-06T14:19:34.000+02:00
diff --git a/reference/constraints.rst b/reference/constraints.rst
@@ -21,6 +21,7 @@ Validation Constraints Reference
    constraints/Hostname
    constraints/Ip
    constraints/Uuid
+   constraints/Ulid
    constraints/Json
 
    constraints/EqualTo
