README: update URIs to https sites
README: update URIs to https sites

Change-Id: I9f4b82fa3b17350ee5ea2af9adc661b811e318b2
Reviewed-on: https://chromium-review.googlesource.com/c/apps/unpacker/+/1591652
Reviewed-by: Joel Hockey <9ecfc52dc2ffef73afac73f3495f294aeddf1231@chromium.org>
Tested-by: Mike Frysinger <8f3f75c74bd5184edcfa6534cab3c13a00a2f794@chromium.org>

vapier/chrome-ext-wicked-good-unarchiver,vapier/chrome-ext-wicked-good-unarchiver,vapier/chrome-ext-wicked-good-unarchiver,vapier/chrome-ext-wicked-good-unarchiver,vapier/chrome-ext-wicked-good-unarchiver