don't use tabstop 2

use 4 instead

sheerun#648
already setting tabstop to 4 but it still resets ps1 file type to 2 at random time

so decided to create a fork and stop the behavior

autoload/polyglot/init.vim

@@ -2712,7 +2712,7 @@ endif
 if !has_key(g:polyglot_is_disabled, 'sensible')
   " Use 2-spaces tab indentation by default
   if &tabstop == 8
-    let &tabstop = 2
+    let &tabstop = 4
   endif
 
   " Set shiftwidth to proper value as users often mix it with tabstop