rename old certificate to 2019, add current and next certificates

i2p2www/static/zlatinb.key.2019.crt

+-----BEGIN CERTIFICATE-----
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+C/yknJKDzUC7295suop4wCSR1y0BIjn4JxYn1tYHWLAdkcd1WRW7oiuA5tiMBzrm
++PUH4qtq5jewq/L7qy9UmE0wHZc0ZQoB/eP1KzhUvbuqrfcXxSDg7VpvhydEO84k
+nlXk1k0vMfGpNlTPcfylzXJ3VOTW9lKkzYWNw00lWObWOzFv7DN/3I9O
+-----END CERTIFICATE-----