message: feat: activates ckb2021 since epoch 2782 in Aggron
diff: /// The Chain Specification name.
  pub const CHAIN_SPEC_NAME: &str = "ckb_testnet";
  -// TODO ckb2021 Update the epoch number for testnet.
  -/// First epoch number for CKB v2021
  -pub const CKB2021_START_EPOCH: u64 = u64::MAX;
  +/// Estimated time for epoch 2782 is 2021-08-30 2AM in UTC.
  +pub const CKB2021_START_EPOCH: u64 = 2782;
  