Vim 8.1 release

Update version number and information.  Fix a couple of tests.
diff --git a/READMEdir/README_w32s.txt b/READMEdir/README_w32s.txt
index 311a177..c4f9a0c 100644
--- a/READMEdir/README_w32s.txt
+++ b/READMEdir/README_w32s.txt
@@ -1,4 +1,4 @@
-README_w32s.txt for version 8.0 of Vim: Vi IMproved.
+README_w32s.txt for version 8.1 of Vim: Vi IMproved.
 
 This archive contains the gvim.exe that was specifically compiled for use in
 the Win32s subsystem in MS-Windows 3.1 and 3.11.