Add Wanchain signing

[vikmeup]

No description provided.

[codecov-io]

Codecov Report

Merging #31 into master will decrease coverage by 0.38%.
The diff coverage is 82.14%.

@@            Coverage Diff             @@
##           master      #31      +/-   ##
==========================================
- Coverage   84.79%   84.41%   -0.39%     
==========================================
  Files          47       50       +3     
  Lines        1822     1867      +45     
==========================================
+ Hits         1545     1576      +31     
- Misses        277      291      +14

Impacted Files	Coverage Δ
Sources/Ethereum/EthereumTransaction.swift	100% <100%> (ø)	⬆️
Tests/Ethereum/TransactionSigningTests.swift	100% <100%> (ø)	⬆️
Sources/Ethereum/TransactionSigning.swift	95.45% <100%> (+0.58%)	⬆️
Sources/Wanchain/WanchainSigner.swift	100% <100%> (ø)
Sources/Wanchain/WanchainTransaction.swift	100% <100%> (ø)
Sources/Ethereum/RLP.swift	53.01% <6.66%> (-4.61%)	⬇️
Sources/Ethereum/SignatureSigner.swift	87.5% <87.5%> (ø)

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