* chore(deps): update dependency eslint-config-airbnb-base to v12.0.0

* fix lint

This is a major refactor of branch code to prepare for Yarn workspaces plus creating PRs for branches with failing lockfiles. Marked as "feature" to cause a minor version bump due to the moderate chance of accidentally breaking something.

Closes #226 

This removes the need to JSON.stringify() objects in logs. Default bunyan fields plus our custom meta fields are stripped out, and everything else is stringified in the details field.

Closes #498

* Move yarn and npm helpers into branch worker

* Fix name

* Move package-json helper

* Update name

* Move changelog

* Move github-app

* Remove unused platform

* Move logger

* Fix lint

* Move package-file worker

* rename to renovatePackageFile

* Move packageJson

* Add getDepTypeConfig

* Add

* Revert "Add"

This reverts commit d034e6149af90caf57de3f1b5069674fd8537bd3.

* Refactor versions

* rename findPackageFileUpgrades

* rename versions

* packageWorker

* Refactor promises

* move snapshots

* Rename

* Refactor versions

* Refactor

* Finish package worker

* Major refactor

* Remove worker tests

* package/versions

* Finish packageWorker tests

* package-json test

* Finish dep-type tests

* Add back package-json helper test

* Refactor package-file

* Add back branch and pr

* Add back remaining worker tests

* update tests

* remove snapshot

* Fix dep-type coverage

* Remove old tests

* Coverage

Closes #317 

* Install traverse

* Scrub api and logger in stringify config

* Use stringifyConfig

* Ignore logs

* Add meta to CLI logs

* Refactor repo structure

* rename repoWorker

* renamed worker

* Refactor logger location

* Refactor main worker

* Refactor getRepoConfig

* Refactor err

* Refactor repo logger

* Add config serializer and logger

* Refactor redact

* Remove stringifyConfig

* Refactor onboarding

* Set packageFile logger

* Refactor package file logic

* branch and pr logging

* Improve log context

* Fix tests part 1

* more test fixes

* Fix github init

* All tests passing

* Rename cli helper

* Refactor logger

* Add logger tests

* Add config serializer tests

* Add configParser tests

* Fix package file tests

* Expand package-file tests

* Use defaultConfig

* Add package-file tests

* Refactor

* Finish package-file tests