Only specify eslint for ALE js linter

vimrc

@@ -528,7 +528,7 @@ let g:UltiSnipsJumpBackwardTrigger="<s-tab>"
 let g:ale_completion_enabled = 0
 let g:airline#extensions#ale#enabled = 1
 let g:ale_linters = {
-      \   'javascript': ['eslint', 'prettier'],
+      \   'javascript': ['eslint'],
       \   'ruby': ['rubocop'],
       \}