ReadingTime calculation should never be under one minute

[caendesilva]

Issue Description

Currently, the ReadingTime calculation in can return 0 minutes, which is not accurate as even a short post would at least be closer to 1 minute to read. Therefore, we should update the calculated minutes time formatting to always be at least one minute.

Steps to Reproduce

1. Create a post with a very short amount of content (e.g. a few sentences).
2. Run the ReadingTime calculation on the post.
3. Note that the calculated time may be 0 minutes.

Expected Behavior

The ReadingTime calculation should always return a minimum of 1 minute, even for very short posts.

Actual Behavior

The ReadingTime calculation can return 0 minutes, which is not accurate.

Possible Solution

Update the ReadingTime calculation to always add 1 to the calculated minutes time.

Credit

Thanks to @rgasch for bringing this issue to my attention.