[slim-vim] Changelog for July

[Larry Clapp]

This caused Vim to segfault:

  :new
  :ecl (vim:buffer-name)

because a [No Name] buffer doesn't actually have a name, it's name
pointer is NULL.  So now (vim:buffer-name) on a [No Name] buffer
returns NIL.

> Sun Jul  9 16:42:49 EDT 2006  Larry Clapp <larry at theclapp.org>
>   * Make (vim:buffer-name) work for a [No Name] buffer