Update runtime files.

runtime/doc/todo.txt

@@ -1,4 +1,4 @@
-*todo.txt*      For Vim version 8.2.  Last change: 2020 Jan 13
+*todo.txt*      For Vim version 8.2.  Last change: 2020 Jan 20
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -184,6 +184,8 @@ wrong.  E.g. in vim.h "Error:", and blowfish.c "error!". (#5299)
 goes to any buffer, and then :bnext skips help buffers, since they are
 unlisted. (#4478)
 
+Patch to include reduce() function. (#5481)
+
 Patch to provide search stats in a variable, so that it can be used in the
 statusline. (Fujiwara Takuya, #4446)
 
@@ -192,6 +194,8 @@ Enable 'termbidi' if $VTE_VERSION >= 5703 ?
 Universal solution to detect if t_RS is working, using cursor position.
 Koichi Iwamoto, #2126
 
+Python 3.8 doesn't work. (Antonios Hadjigeorgalis, #5509)
+
 The :syntax cchar value can only be a single character.  It would be useful to
 support combining characters. (Charles Campbell)  Also #4687
 
@@ -204,6 +208,8 @@ Add "t" action to settagstack(): truncate and add new entries. (#5405)
 
 Result of synID() sometimes wrong in help files. (#5252)
 
+Status line is nut updated when splitting windows. (Marcin Szamotulski, #5496)
+
 Problem showing a line if the number column width changes when using "o".
 (Mateusz Morusiewicz, #4245)
 
@@ -1121,6 +1127,7 @@ Patch for 'cursorlinenr' option. (Ozaki Kiichi, 2016 Nov 30)
 
 When 'completeopt' has "noselect" does not insert a newline. (Lifepillar, 2017
 Apr 23, #1653)
+Can 'completeopt' be made buffer-local? (#5487)
 
 Window resizing with 'winfixheight': With a vertical split the height changes
 anyway. (Tommy allen, 2017 Feb 21, #1502)