refactor: refill optspec at 78 columns.
refactor: refill optspec at 78 columns.

* lib/specl/main.lua (optspec): Refill at 78 columns.

Signed-off-by: Gary V. Vaughan <f9023000f29773649f3850298becb9544b5fd6a9@gnu.org>

gvvaughan/specl