add yParity for Geth compatibility

[gtebrean]

What does this PR do?

Fixes #1951

Where should the reviewer start?

required

Why is it needed?

for Geth compatibility

[codecov]

Codecov Report

Merging #1959 (efeb2ba) into master (f6a2aed) will increase coverage by 0.21%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master    #1959      +/-   ##
============================================
+ Coverage     68.15%   68.36%   +0.21%     
- Complexity     2986     2992       +6     
============================================
  Files           488      488              
  Lines         12501    12510       +9     
  Branches       1627     1631       +4     
============================================
+ Hits           8520     8553      +33     
+ Misses         3507     3482      -25     
- Partials        474      475       +1     

Files Changed	Coverage Δ
...web3j/protocol/core/methods/response/EthBlock.java	92.23% <ø> (ø)
...3j/protocol/core/methods/response/Transaction.java	95.45% <100.00%> (+11.33%)	⬆️

... and 1 file with indirect coverage changes

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[NickSneo]

LGTM