Update runtime files. Convert a couple of help files to utf-8.
diff --git a/runtime/doc/options.txt b/runtime/doc/options.txt
index f6f8de7..93efaec 100644
--- a/runtime/doc/options.txt
+++ b/runtime/doc/options.txt
@@ -1,4 +1,4 @@
-*options.txt*	For Vim version 8.0.  Last change: 2018 Mar 09
+*options.txt*	For Vim version 8.0.  Last change: 2018 Mar 13
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar