message: Update nMinimumChainWork, defaultAssumeValid and chainTxData for testnet
diff: @@ -223,10 +223,10 @@ public:
  consensus.vDeployments[Consensus::DEPLOYMENT_SEGWIT].nTimeout = 999999999999ULL;
  // The best chain should have at least this much work.
  - consensus.nMinimumChainWork = uint256S("0x00000000000000000000000000000000000000000000000d6e528bcf5a3a556f"); // qtum
  + consensus.nMinimumChainWork = uint256S("0x000000000000000000000000000000000000000000000032688a8f5f0e1e15d5"); // qtum
  // By default assume that the signatures in ancestors of this block are valid.
  - consensus.defaultAssumeValid = uint256S("0x39ffa0c5924550db0e75030ff8513c3145d491dff2e17b8e3ea1cea7b4662ff0"); //1079274
  + consensus.defaultAssumeValid = uint256S("0x1781c14b737983eba5b68a1813599e3e0d2c6561e36989281f370a2107a3027b"); //224905
  pchMessageStart[0] = 0x0d;
  pchMessageStart[1] = 0x22;
  @@ -270,10 +270,10 @@ public:
  };
  chainTxData = ChainTxData{
  - // Data as of block 493cccf2ba87ffdabd7afc0f3242c1357fdebdc0b8c7e7adc3c6dc2b1c8ca797 (height 79167)
  - 1517517152,
  - 162802,
  - 0.0132
  + // Data as of block 2820e75dd90210a1dcf59efe839a1e5f212e272c6bcb7fd94e749f5e01822813 (height 239905)
  + 1540769920,
  + 544173,
  + 0.01654274965800273
  };
  consensus.nLastPOWBlock = 5000;
  