patch 8.2.0574: ipv6 feature not shown in :version output

Problem:    Ipv6 feature not shown in :version output.
Solution:   Add ipv6 in :version output. (Ozaki Kiichi, closes #5924)
diff --git a/runtime/doc/eval.txt b/runtime/doc/eval.txt
index 7dbd992..6603376 100644
--- a/runtime/doc/eval.txt
+++ b/runtime/doc/eval.txt
@@ -1,4 +1,4 @@
-*eval.txt*	For Vim version 8.2.  Last change: 2020 Apr 08
+*eval.txt*	For Vim version 8.2.  Last change: 2020 Apr 13
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -10870,6 +10870,7 @@
 insert_expand		Compiled with support for CTRL-X expansion commands in
 			Insert mode. (always true)
 job			Compiled with support for |channel| and |job|
+ipv6			Compiled with support for IPv6 networking in |channel|.
 jumplist		Compiled with |jumplist| support.
 keymap			Compiled with 'keymap' support.
 lambda			Compiled with |lambda| support.