Update boot nodes

Update 4 boot nodes to new ip address

Release v1.1.0

1. Code base is updated to go-ethereum version 1.9.25.
2. A mining node is added as a new bootnode.

Release 1.0.0

1. Activate Constantinople at height 3075000
2. Half reward to 17 NBAI from Constantinople
3. Disable light mode

NBIPS:
https://github.com/nebulaai/NBIPs/blob/master/NBIPs/nbip-001.md

Release 0.0.2

• Add bootnode for testnet.

Release 0.0.1

• Replace Geth with gnbai
• Replace ethbase with nbaibase
• Change the reward to 35 per block
• Update the readme file.