[OH-Dev] [issue817] Provide error stating to use -u

[tsherk]

New submission from tsherk <gfatrevor at gmail.com>:

The error message when someone uploads their diff output, it should suggest that 
the user use diff -u. The current error message does not cover this.

URL for this page: 
http://openhatch.org/missions/diffpatch/diffsingle/submit#diffsingle-form

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messages: 3588
nosy: paulproteus, tsherk
priority: bug
status: unread
title: Provide error stating to use -u

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Roundup issue tracker <bugs at openhatch.org>
<https://openhatch.org/bugs/issue817>
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