patch 8.2.0122: readme files still mention MS-DOS

Problem:    Readme files still mention MS-DOS.
Solution:   Update readme files. (Ken Takata, closes #5486)
diff --git a/README.txt b/README.txt
index 71a3827..ead022b 100644
--- a/README.txt
+++ b/README.txt
@@ -16,10 +16,10 @@
 with ten fingers can work very fast.  Additionally, function keys can be
 mapped to commands by the user, and the mouse can be used.
 
-Vim runs under MS-Windows (NT, 2000, XP, Vista, 7, 8, 10), Macintosh, VMS and
-almost all flavours of UNIX.  Porting to other systems should not be very
-difficult.  Older versions of Vim run on MS-DOS, MS-Windows 95/98/Me, Amiga
-DOS, Atari MiNT, BeOS, RISC OS and OS/2.  These are no longer maintained.
+Vim runs under MS-Windows (XP, Vista, 7, 8, 10), macOS, VMS and almost all
+flavours of UNIX.  Porting to other systems should not be very difficult.
+Older versions of Vim run on MS-DOS, MS-Windows 95/98/Me/NT/2000, Amiga DOS,
+Atari MiNT, BeOS, RISC OS and OS/2.  These are no longer maintained.
 
 
 DISTRIBUTION