Revenge of the 2-digit years

Now that we're deep into the 21st century, we can probably go to
the 2-digit form.

vim/vimrc.statusline

@@ -28,7 +28,7 @@ function! GetYearGlyph()
 
     let year= year % 10
 
-    return glyph . year
+    return decade . year
 endfunction
 
 " This is a rebuild of the original vim status line.  I'll put the original