fix coverage script

[royra]

• run 'yarn fix-coverage-thresholds' to fix the tresholds on the current numbers
• CircleCI job to fix the thresholds weekly

[codecov]

Codecov Report

Merging #755 into master will decrease coverage by 0.09%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master     #755     +/-   ##
=========================================
- Coverage   89.38%   89.29%   -0.1%     
=========================================
  Files         195      195             
  Lines        8715     8667     -48     
  Branches     1580     1562     -18     
=========================================
- Hits         7790     7739     -51     
- Misses        925      928      +3

Flag	Coverage Δ
#unit_test	89.29% <ø> (-0.1%)	⬇️

Impacted Files	Coverage Δ
packages/adapter-api/src/values.ts	36.36% <0%> (-18.19%)	⬇️
packages/adapter-api/src/utils.ts	72.93% <0%> (-4.73%)	⬇️
packages/adapter-api/src/elements.ts	86.79% <0%> (-4.72%)	⬇️
...salesforce-adapter/src/transformers/transformer.ts	96.3% <0%> (-0.23%)	⬇️
...esforce-adapter/src/filters/instance_references.ts	97.56% <0%> (-0.06%)	⬇️
.../hubspot-adapter/src/filters/instance_transform.ts	90% <0%> (ø)	⬆️
...e/src/core/plan/dependency/reference_dependency.ts	100% <0%> (ø)	⬆️
packages/adapter-api/src/builtins.ts	100% <0%> (ø)	⬆️
...es/salesforce-adapter/src/filters/convert_types.ts	100% <0%> (ø)	⬆️
...es/hubspot-adapter/src/transformers/transformer.ts	97.77% <0%> (+0.02%)	⬆️
... and 1 more

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[royra]

Closing while waiting for Jest PR.