Vim 8.1 release

Update version number and information.  Fix a couple of tests.
diff --git a/runtime/doc/indent.txt b/runtime/doc/indent.txt
index 5918300..ac8bf53 100644
--- a/runtime/doc/indent.txt
+++ b/runtime/doc/indent.txt
@@ -1,4 +1,4 @@
-*indent.txt*    For Vim version 8.0.  Last change: 2018 Apr 04
+*indent.txt*    For Vim version 8.1.  Last change: 2018 Apr 04
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar