message: Add checkpoint for testnet
diff: @@ -376,13 +376,13 @@ public:
  checkpointData = {
  {
  -// {546, uint256S("000000002a936ca763904c3c35fce2f3556c559c0214345d31b1bcebf76acb70")},
  + {105, uint256S("6f3b52100061d0ee707a5f920bc6f38c66c24cebdfc9ce296b189fc87047bcd0")},
  }
  };
  chainTxData = ChainTxData{
  // Data from rpc: getchaintxstats 4096 0000000000000037a8cd3e06cd5edbfe9dd1dbcc5dacab279376ef7cfc2b4c75
  - /* nTime */ 1531929919,
  + /* nTime */ 1543868766,
  /* nTxCount */ 19438708,
  /* dTxRate */ 0.626
  };
  @@ -390,7 +390,7 @@ public:
  /* enable fallback fee on testnet */
  m_fallback_fee_enabled = true;
  - strNetworkRewardAddress = "2N9sWUmygPRy1c14eFWt8FzA8YF4JgA6j6a";
  + strNetworkRewardAddress = "tv1qhzkv6xdc7zpfx9ldsrqpk84hkcf36kclsyyeeh";
  nMaxNetworkReward = 10 * COIN;
  /** Zerocoin */
  