Add MultiSendDecode command to bin.js

[leomassazza]

Adds a command to the bin.js to decode Gnosis multi-send payload.

Usage: ./bin.js decode-multi-send MULTI SEND transactions(bytes)

i.e.

./bin.js decode-multi-send 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

will result in the following output

[
  {
    index: 1,
    target: '0x8d203c458d536fe0f97e9f741bc231eac8cd91cf',
    operationType: 'Call',
    value: 0,
    decoded: {
      method: {
        name: 'setInflationAmount',
        params: [
          {
            name: 'amount',
            value: '1859105055499999917375488',
            type: 'uint256'
          }
        ]
      },
      contract: 'SupplySchedule'
    }
  },
  {
    index: 1,
    target: '0x29c295b046a73cde593f21f63091b072d407e3f2',
    operationType: 'Call',
    value: 0,
    decoded: {
      method: {
        name: 'editRewardDistribution',
        params: [
          { name: 'index', value: '2', type: 'uint256' },
          {
            name: 'destination',
            value: '0x39ea01a0298c315d149a490e34b59dbf2ec7e48f',
            type: 'address'
          },
          {
            name: 'amount',
            value: '743642022000000063504384',
            type: 'uint256'
          }
        ]
      },
      contract: 'RewardsDistribution'
    }
  }
]

[codecov]

Codecov Report

Merging #1856 (4e742a9) into develop (0cb16b5) will not change coverage.
The diff coverage is n/a.

❗ Current head 4e742a9 differs from pull request most recent head 0d70b44. Consider uploading reports for the commit 0d70b44 to get more accurate results

@@           Coverage Diff            @@
##           develop    #1856   +/-   ##
========================================
  Coverage    94.91%   94.91%           
========================================
  Files          106      106           
  Lines         2634     2634           
  Branches       797      797           
========================================
  Hits          2500     2500           
  Misses         134      134           

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