Server needs Postgres 9.5 to support ON CONFLICT DO NOTHING

[todo]

In the meantime, we will just ignore the result from the following execute.

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noted/db/src/models.rs

Lines 254 to 259 in 0787ff0

	// TODO: Server needs Postgres 9.5 to support ON CONFLICT DO NOTHING
	// BODY: In the meantime, we will just ignore the result from the following execute.
	let _ = diesel::insert_into(tags)
	.values(&set_tags.iter().map(|t| tag.eq(t)).collect::<Vec<_>>())
	// .on_conflict_do_nothing()
	.execute(db);

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This issue was generated by todo based on a TODO comment in 0787ff0 when #65 was merged. cc @zmbush.