Update email address for PyPI package to use discourse
Update email address for PyPI package to use discourse

It's been a bit since we switched from using sourceforge, but we accidentally
missed updating this.  Rectify that oversight

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Signed-off-by: Lydia Duncan <f955cf5f42dff0db8f444c4740a67a0cf0b4805d@users.noreply.github.com>

chapel-lang/sphinxcontrib-chapeldomain