Disable gopls diagnostics

Fixes #178

lua/user/lsp/handlers.lua

@@ -84,6 +84,9 @@ M.on_attach = function(client, bufnr)
   if client.name == "tsserver" then
     client.resolved_capabilities.document_formatting = false
   end
+  if client.name == "gopls" then
+    client.resolved_capabilities.languageServerExperimentalFeatures.diagnostics = false
+  end
   lsp_keymaps(bufnr)
   lsp_highlight_document(client)
 end