Let's not check for opinions released on weekends

This might be worth a day or two of scraper time.

(A further refinement would use the quarterly lists of opinion releases to target only the exact days where opinions were released rather than working through a span of dates.  Those pages are easy to access on the legacy sites.  The TAMES version is hidden behind a form that looks like a mess, so it might not be worth our time to do for this one-time optimization.)