patch 7.4.1992
Problem:    Values for true and false can be confusing.
Solution:   Update the documentation.  Add a test.  Make v:true evaluate to
            TRUE for a non-zero-arg.
diff --git a/src/version.c b/src/version.c
index c6ab5f4..f235d76 100644
--- a/src/version.c
+++ b/src/version.c
@@ -759,6 +759,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1992,
+/**/
     1991,
 /**/
     1990,