Turn on esModuleInterop flag in typescript

[remagpie]

Fix #68

[codecov-io]

Codecov Report

Merging #69 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master      #69   +/-   ##
=======================================
  Coverage   91.75%   91.75%           
=======================================
  Files          16       16           
  Lines         983      983           
  Branches      216      216           
=======================================
  Hits          902      902           
  Misses         81       81

Impacted Files	Coverage Δ
src/address/PlatformAddress.ts	46.15% <100%> (ø)	⬆️
src/key/key.ts	100% <100%> (ø)	⬆️
src/address/AssetAddress.ts	96.72% <100%> (ø)	⬆️
src/key/schnorr.ts	77.89% <100%> (ø)	⬆️
src/key/ecdsa.ts	75.55% <100%> (ø)	⬆️

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