chore: start converting to es classes

[JustinBeckwith]

@callmehiphop @stephenplusplus The system tests on master seem to fail for me (and this PR), but are passing in CI scratches head. Can y'all try running the system tests against this branch?

There are actually very few changes in here, sorry the GH diff is so bad.

[codecov]

Codecov Report

Merging #173 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master   #173   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           5      5           
  Lines         646    616   -30     
=====================================
- Hits          646    616   -30

Impacted Files	Coverage Δ
src/query.js	100% <100%> (ø)	⬆️
src/request.js	100% <100%> (ø)	⬆️
src/transaction.js	100% <100%> (ø)	⬆️

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[stephenplusplus]

Both master and this PR's system tests pass for me. Were you getting errors locally from this branch's system tests? What were they?

[JustinBeckwith]

Tons of strictEqual errors:

Uncaught AssertionError [ERR_ASSERTION]: Input A expected to strictly deep-equal input B:

Which in retrospect, is probably my fault. But I'm weirded out that nobody else is seeing them?