Fix sites_https detective so it's case-insensitive
Fix sites_https detective so it's case-insensitive

  URLs are traditionally lower-case, but technically HTTP:
  also works, so let's detect that as well.

Signed-off-by: David A. Wheeler <9ae72d22d8b894b865a7a496af4fab6320e6abb2@dwheeler.com>

yannickmoy/cii-best-practices-badge,jdossett/cii-best-practices-badge,wanganyv/cii-best-practices-badge,taylorcoursey/cii-best-practices-badge,coreinfrastructure/best-practices-badge,wanganyv/cii-best-practices-badge,linuxfoundation/cii-best-practices-badge,taylorcoursey/cii-best-practices-badge,jdossett/cii-best-practices-badge,taylorcoursey/cii-best-practices-badge,linuxfoundation/cii-best-practices-badge,coreinfrastructure/best-practices-badge,linuxfoundation/cii-best-practices-badge,linuxfoundation/cii-best-practices-badge,taylorcoursey/cii-best-practices-badge,jdossett/cii-best-practices-badge,yannickmoy/cii-best-practices-badge,yannickmoy/cii-best-practices-badge,coreinfrastructure/best-practices-badge,wanganyv/cii-best-practices-badge,yannickmoy/cii-best-practices-badge,jdossett/cii-best-practices-badge,wanganyv/cii-best-practices-badge,coreinfrastructure/best-practices-badge