Default to foundation 620 api

[Speedy37]

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[codecov]

Codecov Report

Merging #203 into master will increase coverage by 0.14%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #203      +/-   ##
==========================================
+ Coverage   76.68%   76.83%   +0.14%     
==========================================
  Files          16       16              
  Lines        3054     3052       -2     
==========================================
+ Hits         2342     2345       +3     
+ Misses        712      707       -5     

Impacted Files	Coverage Δ
foundationdb/src/transaction.rs	79.72% <0.00%> (-1.05%)	⬇️
foundationdb/src/tuple/pack.rs	87.71% <0.00%> (-0.17%)	⬇️
foundationdb-bindingtester/src/main.rs	88.63% <0.00%> (-0.09%)	⬇️
foundationdb-gen/src/lib.rs	0.00% <0.00%> (ø)
foundationdb/src/future.rs	87.02% <0.00%> (+0.07%)	⬆️
foundationdb/src/api.rs	84.28% <0.00%> (+0.22%)	⬆️
foundationdb/src/tuple/mod.rs	90.88% <0.00%> (+1.06%)	⬆️

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