Add log entry for each dependency.

autoload/vundle/installer.vim

@@ -23,7 +23,7 @@ func! vundle#installer#new(bang, ...) abort
 endf
 
 
-" ---------------------------------------------------------------------------
+" ---------------------------------------------------------------------------dep
 " Iterate over all lines in a Vundle window and execute the given command for
 " every line.  Used by the installation and cleaning functions.
 "
@@ -449,6 +449,7 @@ func! s:sync(bang, bundle) abort
       for dependency in deps
         if !has_key(g:bundle_names, dependency)
           let newbundle = vundle#config#bundle(dependency)
+          call s:log("Dependency '" . dependency . "'")
           if (s:sync(a:bang, newbundle) == 'error')
             return 'error'
           endif