vim-patch:7.4.1989

Problem:    filter() and map() only accept a string argument.
Solution:   Implement using a Funcref argument (Yasuhiro Matsumoto, Ken
            Takata)

b33c7eb5b8

src/nvim/version.c

@@ -451,7 +451,7 @@ static int included_patches[] = {
   // 1992,
   // 1991,
   1990,
-  // 1989,
+  1989,
   // 1988 NA
   // 1987 NA
   // 1986,