Add prettier config and sort imports, reports coverage on pr's

[Sparticuz]

fixes #13

[github-actions]

Coverage after merging feature/coverageReporting into master will be

91.33%

Coverage Report

File	Stmts	Branches	Funcs	Lines	Uncovered Lines
src
address-validate.ts	88.14%	37.50%	100%	96%	51–53, 55, 80–81, 83–87, 92–93, 96
usps.ts	100%	100%	100%	100%
src/lookups
city-state-lookup.ts	98.25%	83.33%	100%	100%	45
pricing-rate-lookup.ts	74.34%	100%	50%	74.50%	112–149
zip-code-lookup.ts	90.59%	54.55%	100%	95.83%	56–57, 59–63, 68
src/utils
proper-case.ts	100%	100%	100%	100%
request.ts	91.62%	64.29%	100%	94.08%	107–108, 117–119, 122–125, 151, 50–52, 58