Add python formatter

lua/codecraft/plugin/lsp/null-ls.lua

@@ -8,8 +8,8 @@ local augroup = vim.api.nvim_create_augroup("LspFormatting", {})
 
 local formatters_linters = {
   prettier = {},
-  erb_lint = {},
   rustfmt = {},
+  black = {},
 }
 
 mason_null_ls.setup({
@@ -18,8 +18,8 @@ mason_null_ls.setup({
 null_ls.setup ({
   sources = {
     formatting.prettier,
-    diagnostics.erb_lint,
     formatting.rustfmt,
+    formatting.black,
   },
   on_attach = function(current_client, bufnr)
     if current_client.supports_method("textDocument/formatting") then