[lsp] bow to rust-analyzer

lua/config/lspconfig.lua

@@ -31,7 +31,7 @@ local on_attach = function(client, bufrn)
 end
 
 -- Launch language servers
-local servers = { 'pylsp', 'gopls', 'rls', 'tsserver', 'elixirls', 'dartls', 'denols', 'clangd' }
+local servers = { 'pylsp', 'gopls', 'rust_analyzer', 'tsserver', 'elixirls', 'dartls', 'denols', 'clangd' }
 for _, lsp in ipairs(servers) do
   nvim_lsp[lsp].setup {
     on_attach = on_attach,