Vim 8.1 release

Update version number and information.  Fix a couple of tests.
diff --git a/READMEdir/README_src.txt b/READMEdir/README_src.txt
index 3ac2975..89b8357 100644
--- a/READMEdir/README_src.txt
+++ b/READMEdir/README_src.txt
@@ -1,8 +1,8 @@
-README_src.txt for version 8.0 of Vim: Vi IMproved.
+README_src.txt for version 8.1 of Vim: Vi IMproved.
 
 The source archive contains the files needed to compile Vim on Unix systems.
 It is packed for Unix systems (NL line separator).
 
 For more information, see the README.txt file that comes with the runtime
-archive (vim-8.0-rt.tar.gz).  To be able to run Vim you MUST get the runtime
+archive (vim-8.1-rt.tar.gz).  To be able to run Vim you MUST get the runtime
 archive too!