fix(deps): update dependency https-proxy-agent to v4

[renovate-bot]

This PR contains the following updates:

Package	Type	Update	Change
https-proxy-agent	dependencies	major	^3.0.0 -> ^4.0.0

---

Release Notes

TooTallNate/node-https-proxy-agent

v4.0.0

Compare Source

Major Changes

• Set "engines" requirement to node 6.0.0: #​82
• Update dependencies: c846a68

Minor Changes

• Update debug to v4.0.0: #​82

Patches

• Use localhost instead of 127.0.0.1 in tests: 829905f

Credits

Huge thanks to @​Krinkle for helping!

---

Renovate configuration

📅 Schedule: "after 9am and before 3pm" (UTC).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻️ Rebasing: Whenever PR is stale, or if you modify the PR title to begin with "rebase!".

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• If you want to rebase/retry this PR, check this box

---

Newsflash: Renovate has joined WhiteSource, and is now free for all use. Learn more or view updated terms and privacy policies.

[codecov]

Codecov Report

Merging #201 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #201   +/-   ##
=======================================
  Coverage   96.64%   96.64%           
=======================================
  Files           4        4           
  Lines         597      597           
  Branches      100      100           
=======================================
  Hits          577      577           
  Misses         19       19           
  Partials        1        1

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 2cb24ab...a54d2d3. Read the comment docs.