[FR] Make `start_tweet` and `end_tweet` optional

[chainsawriot]

Describe the solution you'd like

academictwitteR/R/get_all_tweets.R

Lines 71 to 76 in 2d3744a

	if (missing(start_tweets)) {
	stop("Start time must be specified.")
	}
	if (missing(end_tweets)) {
	stop("End time must be specified.")
	}

Currently, both are required. But the official API documentation says the corresponding parameters (start_time and end_time) are optional and they will be filled with some sensible default values: start_time = 30 days ago; end_time = now -30 seceond

It makes a lot of sense if I want to search something from so long ago up to now, I can simply search ignore the end_tweet parameter.

Anything else?

No response