Update runtime files.
diff --git a/runtime/doc/develop.txt b/runtime/doc/develop.txt
index 2e00ccf..97823f3 100644
--- a/runtime/doc/develop.txt
+++ b/runtime/doc/develop.txt
@@ -1,4 +1,4 @@
-*develop.txt*   For Vim version 8.0.  Last change: 2018 Apr 17
+*develop.txt*   For Vim version 8.0.  Last change: 2018 Apr 18
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar