[typo] README: potential typo in one of the code sample

[ayushanand18]

Overview

There seems to be a minor typo in the code example listed on the README. Please correct me if I am wrong.

Bug

In the README we have:
Filter from a datetime (the 'start' parameter)

from dateime import dateime, timedelta
collector.filter(start=datetime.utcnow() - timedelta(hours=1))

and similarly at 2 more places. I believe dateime must be datetime package.

Solution

Update dateime to datetime everywhere.

[ayushanand18]

I couldn't see much activity in this repo, and I am sorry for this pretty simple issue.