Add doc about extracting timestamps with no spaces

Timestamp formats may have no space between date and time components and cause the script to fail.
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Greg Bodnar 2019-08-04 15:26:55 +12:00 committed by GitHub
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@ -96,7 +96,10 @@ log_question 'What did I make progress with?'
### Filtering with FZF
Use the search powers of [fzf](https://github.com/junegunn/fzf) to select an
entry from the list of titles and display the full entry.
entry from the list of titles and display the full entry. The invocation of
`cut` needs to match the format of the timestamp. For timestamps that have a
space between data and time components, select fields 1 and 2 as shown. For
timestamps that have no whitespace, select only field 1.
``` sh
jrnl -on "$(jrnl --short | fzf --ansi --tac | cut -d' ' -f1,2)"