release version 9.0

Problem:    About time to release Vim 9.0.
Solution:   Update the version number everywhere.
diff --git a/runtime/doc/recover.txt b/runtime/doc/recover.txt
index c8f3d8f..db58241 100644
--- a/runtime/doc/recover.txt
+++ b/runtime/doc/recover.txt
@@ -1,4 +1,4 @@
-*recover.txt*   For Vim version 8.2.  Last change: 2020 Aug 15
+*recover.txt*   For Vim version 9.0.  Last change: 2020 Aug 15
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar