Append parentheses to function name in text completion

Previously, when using the text completion feature for function
names, it didn't automatically add parentheses.

Fixed it.

internal/lsp/completion.go

@@ -111,8 +111,13 @@ func (s *server) Completion(ctx context.Context, reply jsonrpc2.Replier, req jso
  if pkg != nil {
  for _, s := range pkg.Symbols {
  items = append(items, protocol.CompletionItem{
- Label: s.Name,
- InsertText: s.Name,
+ Label: s.Name,
+ InsertText: func() string {
+ if s.Kind == "func" {
+ return s.Name + "()"
+ }
+ return s.Name
+ }(),
  Kind: symbolToKind(s.Kind),
  Detail: s.Signature,
  Documentation: s.Doc,