Updateable reserveRatio for GNS

[jona]

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Summary

We currently have no way to set reserveRatio in the GNS contract through governance.

Solution

Add a setReserveRatio function that allows us to set reserverRatio

[codecov[bot]]

Codecov Report

Merging #515 (f8503f0) into dev (6962037) will increase coverage by 0.04%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##              dev     #515      +/-   ##
==========================================
+ Coverage   91.91%   91.96%   +0.04%     
==========================================
  Files          33       33              
  Lines        1658     1667       +9     
  Branches      282      284       +2     
==========================================
+ Hits         1524     1533       +9     
  Misses        134      134              

Flag	Coverage Δ
unittests	91.96% <100.00%> (+0.04%)	:arrow_up:

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Impacted Files	Coverage Δ
contracts/discovery/GNS.sol	99.30% <100.00%> (+0.04%)	:arrow_up:

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