Update deps, require node 8

[bendrucker]

This would require a major version bump, which I think we should be doing anyway as numeric/binary oriented changes have been piling up in master. @brianc are you ok with going ahead with a major release of node-postgres as well? Node 4's EOL was about 1.5 years ago. 8's is coming up (December).

Closes #104

[charmander]

Breaking changes also worth considering for a major release:

• integer types as BigInt instead of string for much better type safety (requires Node 10, so maybe not if this is targeted at Node 8) (Use native BigInt type in Node 10+ #78)

• no Date conversion for date and (maybe?) timestamp without time zone (Do not return DATE fields as Javascript Date #50, Inconsistent (date) values when working with Timezones #81)

• removal of lib/arrayParser.js

[bendrucker]

I think we should just get a major release out and evaluate dates and big ints for a later major. We haven't been doing many of these releases. Removing lib/arrayParser.js seems easy/uncontroversial.

@brianc Thoughts on doing a major release for Node 8 and then doing a future major for Node 12 that incorporates BigInt + Date changes?

[brianc]

Thoughts on doing a major release for Node 8 and then doing a future major for Node 12 that incorporates BigInt + Date changes?

Yeah I'm down with that. You want a major bump in node-posgres core as well right? I can sweep in a couple other breaking changes we wanted to make too.

[bendrucker]

You want a major bump in node-posgres core as well right?

Yup, major bump here, and then a major bump in node-postgres updating the dep.

[codecov-io]

Codecov Report

Merging #105 into master will increase coverage by 0.6%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master     #105     +/-   ##
=========================================
+ Coverage   88.01%   88.62%   +0.6%     
=========================================
  Files           5        4      -1     
  Lines         217      211      -6     
=========================================
- Hits          191      187      -4     
+ Misses         26       24      -2

Impacted Files	Coverage Δ
index.js	75% <ø> (-2.28%)	⬇️

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[bendrucker]

Finally took the time to merge this and release 3.0 to npm. Happy to take on further breaking changes in 4.0 which might be node 12+ assuming it comes early 2020.

@brianc Do you need any help landing other changes to node-postgres? If not I can just open the PR bumping the pg-types dep and setting engines.node.

[gajus]

What is the correct way to parse the array now?

This broke gajus/slonik#182

[gajus]

This is how I fixed it gajus/slonik@042669d, but not sure if that was the expected way.

[charmander]

@gajus That works, yes. You can also write parseArray(arrayValue, typeParser.parse).