"Error: cannot detect lang" occurs when executing the "acd prepare" command

[m0ch1m0ch1]

The following error occurs when executing the "acd prepare" command.

$ acd prepare abc100
Error: cannot detect lang

This error may be that the value of val specified in L96 of parse.go is becoming outdated. Probably should be changed to 5001.

ac-deck/lib/atcoder/parse.go

Lines 92 to 98 in e918215

	if val == "3001" {
	panic("Not supporting old environment")
	}
	if val == "4001" {
	result = LangNew
	}