Use 'new' & 'updated' to build updated_bundle list

Distinction between `new` and `updated` simplifies the process
of adding a bundle to the updated_bundle list.

autoload/vundle/installer.vim

@@ -227,7 +227,7 @@ func! s:sync(bang, bundle) abort
     return 'todate'
   endif
 
-  call s:add_to_updated_bundle_list(a:bundle)
+  call add(g:updated_bundles, a:bundle)
   return 'updated'
 endf
 
@@ -240,14 +240,6 @@ func! s:add_update_tag(bundle) abort
         \  ' && git tag -a vundle_update -m "Last Vundle Update" -f')
 endfunc
 
-func! s:add_to_updated_bundle_list(bundle) abort
-  let current_commit = s:system('cd '.shellescape(a:bundle.path()).' && git rev-list HEAD')
-  let initial_commit = s:system('cd '.shellescape(a:bundle.path()).' && git rev-list vundle_update')
-  if (0 == v:shell_error) && (initial_commit != current_commit)
-    call add(g:updated_bundles, a:bundle)
-  endif
-endfunc
-
 func! s:log(str) abort
   let fmt = '%y%m%d %H:%M:%S'
   call add(g:vundle_log, '['.strftime(fmt).'] '.a:str)

autoload/vundle/scripts.vim

@@ -35,15 +35,17 @@ endf
 
 func! s:create_changelog() abort
   for bundle in g:updated_bundles
-    let update_sha = system('cd '.shellescape(bundle.path()).' && git rev-list -1 vundle_update')[0:9]
     let updates = system('cd '.shellescape(bundle.path()).
           \              ' && git log --pretty=format:"%s   %an, %ar" --graph'.
           \              ' vundle_update..HEAD')
     call add(g:vundle_changelog, '')
     call add(g:vundle_changelog, 'Updated Bundle: '.bundle.name)
+
     if bundle.uri =~ "https://github.com"
+      let update_sha = system('cd '.shellescape(bundle.path()).' && git rev-list -1 vundle_update')[0:9]
       call add(g:vundle_changelog, 'Compare at: '.bundle.uri[0:-5].'/compare/'.update_sha.'...HEAD')
     endif
+
     for update in split(updates, '\n')
       let update = substitute(update, '\s\+$', '', '')
       call add(g:vundle_changelog, '  '.update)