[PE-D] Incorrect parsing for edit command

[nus-pe-bot]

From the User Guide, the edit command is edit -b BODY.
However, I have discovered that simply typing edit BODY works as well.
Another edge case that you might want to consider is if the user types edit -t BODY, because of the above issue, the body of the note becomes -t BODY, but maybe an error should be thrown to let the user know that the title of the note cannot be edited.

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Labels: severity.Medium type.FunctionalityBug
original: chishanw/ped#3

[firzanarmani]

Closed by #416 and other related issues