Vim 8.1 release

Update version number and information.  Fix a couple of tests.
diff --git a/runtime/doc/workshop.txt b/runtime/doc/workshop.txt
index e7dd9b0..8a699a4 100644
--- a/runtime/doc/workshop.txt
+++ b/runtime/doc/workshop.txt
@@ -1,4 +1,4 @@
-*workshop.txt*  For Vim version 8.0.  Last change: 2013 Jul 06
+*workshop.txt*  For Vim version 8.1.  Last change: 2013 Jul 06
 
 
 		  VIM REFERENCE MANUAL    by Gordon Prieur