Add note about Amazon
Add note about Amazon

![screenshot](https://i.imgur.com/GQRaMxB.png)

I think this is relevant because many people prefer software tokens because they **don't** have to share their phone number with the vendor.
Most of the other sites do not require this extra step and provide a set of backup tokens instead.
kojaxs/twofactorauth,RichJeanes/twofactorauth,rj175/twofactorauth,bceasydns/twofactorauth,NormandLemay/twofactorauth,rugk/twofactorauth,stephengroat/twofactorauth,rugk/twofactorauth,ahelpingchip/twofactorauth,Criminalllz/twofactorauth,brierjon/twofactorauth,ahelpingchip/twofactorauth,bjorno/twofactorauth,gingerbeardman/twofactorauth,seitsu/twofactorauth,vgarmash/twofactorauth,seitsu/twofactorauth,stephengroat/twofactorauth,brierjon/twofactorauth,Criminalllz/twofactorauth,Nitrokey/dongleauth,hilliuse/twofactorauth,jdavis/twofactorauth,gingerbeardman/twofactorauth,Nitrokey/dongleauth,Nitrokey/dongleauth,baileybasiscode/twofactorauth,stephengroat/twofactorauth,cez81/twofactorauth,jtamplin/twofactorauth,Nanotraktor/twofactorauth,kojaxs/twofactorauth,cez81/twofactorauth,Criminalllz/twofactorauth,ilyakatz/twofactorauth,rj175/twofactorauth,baileybasiscode/twofactorauth,Nanotraktor/twofactorauth,bjorno/twofactorauth,hilliuse/twofactorauth,ilyakatz/twofactorauth,hilliuse/twofactorauth,Jawshy/twofactorauth,NormandLemay/twofactorauth,ahelpingchip/twofactorauth,brierjon/twofactorauth,jdavis/twofactorauth,RichJeanes/twofactorauth,kojaxs/twofactorauth,Jawshy/twofactorauth,vgarmash/twofactorauth,rugk/twofactorauth,RichJeanes/twofactorauth,jdavis/twofactorauth,Jawshy/twofactorauth,bjorno/twofactorauth,Jawshy/twofactorauth,jtamplin/twofactorauth,jtamplin/twofactorauth,baileybasiscode/twofactorauth,Nanotraktor/twofactorauth,cez81/twofactorauth,NormandLemay/twofactorauth,ilyakatz/twofactorauth,gingerbeardman/twofactorauth,rj175/twofactorauth,bceasydns/twofactorauth,bceasydns/twofactorauth,vgarmash/twofactorauth,seitsu/twofactorauth