Update banking.yml

Add San Diego County Credit Union bank.
Add San Diego County Credit Union bank image.
Add hardware 2FA note to PayPal

Add a note to PayPal's section in _data\payments.yml, explaining that
hardware based two-factor authentication is no longer available. Fixes
#880.
Add bitcoin.de
Add bitcoin.de logo
Merge pull request #884 from glippert/master

Add San Diego County Credit Union bank
Remove hardware support for PayPal

Explicitly state that hardware support for two-factor authentication
with PayPal is not available.
Rename bitcoin.png to bitcoinde.png
Merge pull request #885 from psgs/paypal-fix

Add hardware 2FA note to PayPal
Merge pull request #888 from silsha/patch-1

Add bitcoin.de
Update other.yml
Updated Tresorit

They also have phone call support.
Merge pull request #890 from vzvenyach/patch-1

Trello in progress
Merge pull request #891 from jamcat22/patch-tresorit

Updated Tresorit in backup.yml