Configure Renovate (googleapis#835)

Welcome to [Renovate](https://togithub.com/renovatebot/renovate)! This is an onboarding PR to help you understand and configure settings before regular Pull Requests begin.

:vertical_traffic_light: To activate Renovate, merge this Pull Request. To disable Renovate, simply close this Pull Request unmerged.



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### Configuration Summary

Based on the default config's presets, Renovate will:

  - Start dependency updates only once this onboarding PR is merged
  - Separate major versions of dependencies into individual branches/PRs
  - Do not separate patch and minor upgrades into separate PRs for the same dependency
  - Upgrade to unstable versions only if the existing version is unstable
  - Raise PRs immediately (after branch is created)
  - If semantic commits detected, use semantic commit type <code>fix</code> for dependencies and <code>chore</code> for all others
  - Keep existing branches updated even when not scheduled
  - Disable automerging feature - wait for humans to merge all PRs
  - Ignore `node_modules`, `bower_components`, `vendor` and various test/tests directories
  - Update existing lock files only when <code>package.json</code> is modified
  - Autodetect whether to pin dependencies or maintain ranges
  - Rate limit PR creation to a maximum of two per hour
  - Limit to maximum 20 open PRs at any time
  - Group known monorepo packages together
  - Use curated list of recommended non-monorepo package groupings

:abcd: Would you like to change the way Renovate is upgrading your dependencies? Simply edit the `renovate.json` in this branch with your custom config and the list of Pull Requests in the "What to Expect" section below will be updated the next time Renovate runs.

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You have configured Renovate to use branch `master` as base branch.


### What to Expect

It looks like your repository dependencies are already up-to-date and no Pull Requests will be necessary right away.

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:question: Got questions? Check out Renovate's [Docs](https://docs.renovatebot.com/), particularly the Getting Started section.
If you need any further assistance then you can also [request help here](https://togithub.com/renovatebot/config-help/issues).

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This PR has been generated by [WhiteSource Renovate](https://renovate.whitesourcesoftware.com). View repository job log [here](https://app.renovatebot.com/dashboard#googleapis/google-api-python-client).

Author: renovate-bot

Diff for: renovate.json

@@ -0,0 +1,5 @@
+{
+  "extends": [
+    "config:base"
+  ]
+}