[Consensus] Set v5.5 activation height for mainnet
[Consensus] Set v5.5 activation height for mainnet

Mainnet activation height set to 3672000

PIVX-Project/PIVX,PIVX-Project/PIVX,PIVX-Project/PIVX,PIVX-Project/PIVX,PIVX-Project/PIVX,PIVX-Project/PIVX,PIVX-Project/PIVX,PIVX-Project/PIVX,PIVX-Project/PIVX