v1.6.2

For Business-end, including:

• Add Testnet to support projects to try any functions as well as test campaigns.

• Support Variable Reward Amount in case the value of tokens is changing.

• Add Extra Bonus if projects need to provide more prizes.

• Add YouTube Watching Task.

• Support Campaign Updates after it starts, including End Time, Campaign Description, Banner, Links for Twitter, TG, Discord, Specific web.