nvim: init.vim: Use GHCi backend for Intero

Signed-off-by: Sanchayan Maity <maitysanchayan@gmail.com>

nvim/init.vim

@@ -263,6 +263,12 @@ let g:intero_type_on_hover = 0
 let g:intero_window_size = 15
 " Sets the intero window to split vertically; default is horizontal
 let g:intero_vertical_split = 1
+" Use GHCi backend
+let g:intero_backend = {
+            \ 'command': 'stack repl',
+            \ 'options': '-Wall',
+            \ 'cwd': expand('%:p:h'),
+            \ }
 
 " Use deoplete
 let g:deoplete#enable_at_startup = 1