Fix ABI encoding of addresses

[alejandro-isaza]

Fix trustwallet/trust-wallet-ios#599

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@d7bf258). Click here to learn what that means.
The diff coverage is 100%.

@@            Coverage Diff            @@
##             master       #5   +/-   ##
=========================================
  Coverage          ?   82.03%           
=========================================
  Files             ?       17           
  Lines             ?      757           
  Branches          ?        0           
=========================================
  Hits              ?      621           
  Misses            ?      136           
  Partials          ?        0

Impacted Files	Coverage Δ
Sources/Solidity/ABIEncoder.swift	85.71% <100%> (ø)
Tests/Solidity/ERC20EncoderTests.swift	100% <100%> (ø)

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