Typo in calucations about twitter limits

[LeoVS09]

In readme Motivation section, in line

With Twitter's Search API you can only send 180 Requests every 15 minutes. With a maximum number of 100 tweets per Request, you can mine 72 tweets per hour (4 x 180 x 100 =72)

typo.

4 x 180 x 100 is not 72, it actually 72000 So it not 72 tweets per hour