Issue: #163

* build(python): enable flakybot on library unit and system tests

Source-Author: Bu Sun Kim <[email protected]>
Source-Date: Wed Feb 17 14:10:46 2021 -0700
Source-Repo: googleapis/synthtool
Source-Sha: d17674372e27fb8f23013935e794aa37502071aa
Source-Link: googleapis/synthtool@d176743

* chore: add pre-commit-config to renovate ignore paths

Disable renovate PRs on the .pre-commit-config.yaml which is templated from synthtool. https://docs.renovatebot.com/configuration-options/#ignorepaths

Source-Author: Bu Sun Kim <[email protected]>
Source-Date: Mon Mar 15 09:05:39 2021 -0600
Source-Repo: googleapis/synthtool
Source-Sha: 2c54c473779ea731128cea61a3a6c975a08a5378
Source-Link: googleapis/synthtool@2c54c47

* chore(python): add kokoro configs for periodic builds against head

This change should be non-destructive.

Note for library repo maintainers:
After applying this change, you can easily add (or change) periodic
builds against head by adding config files in google3.

See python-pubsub repo for example.

Source-Author: Takashi Matsuo <[email protected]>
Source-Date: Fri Mar 19 11:17:59 2021 -0700
Source-Repo: googleapis/synthtool
Source-Sha: 79c8dd7ee768292f933012d3a69a5b4676404cda
Source-Link: googleapis/synthtool@79c8dd7

* chore(deps): update precommit hook pycqa/flake8 to v3.9.0

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [pycqa/flake8](https://gitlab.com/pycqa/flake8) | repository | minor | `3.8.4` -> `3.9.0` |

---

### Release Notes

<details>
<summary>pycqa/flake8</summary>

### [`v3.9.0`](https://gitlab.com/pycqa/flake8/compare/3.8.4...3.9.0)

[Compare Source](https://gitlab.com/pycqa/flake8/compare/3.8.4...3.9.0)

</details>

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### Renovate configuration

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

:recycle: **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

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

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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#github/googleapis/synthtool).

Source-Author: WhiteSource Renovate <[email protected]>
Source-Date: Tue Mar 23 17:38:03 2021 +0100
Source-Repo: googleapis/synthtool
Source-Sha: f5c5904fb0c6aa3b3730eadf4e5a4485afc65726
Source-Link: googleapis/synthtool@f5c5904

Source-Author: Anthonios Partheniou <[email protected]>
Source-Date: Tue Apr 6 11:32:03 2021 -0400
Source-Repo: googleapis/synthtool
Source-Sha: 5b5bf6d519b2d658d9f2e483d9f6f3d0ba8ee6bc
Source-Link: googleapis/synthtool@5b5bf6d

This is the sibling PR to GoogleCloudPlatform/python-docs-samples#5611
and this is the issue opened for it GoogleCloudPlatform/python-docs-samples#5549

* chore: prevent normalization of semver versioning

* chore: update workaround to make sic work

* chore: loosening setuptools 46.x for Python2

…178)

Thank you for opening a Pull Request! Before submitting your PR, there are a few things you can do to make sure it goes smoothly:
- [x] Make sure to open an issue as a [bug/issue](https://github.com/googleapis/python-api-core/issues/new/choose) before writing your code!  That way we can discuss the change, evaluate designs, and agree on the general idea
- [x] Ensure the tests and linter pass
- [x] Code coverage does not decrease (if any source code was changed)
- [x] Appropriate docs were updated (if necessary)

Fixes #176 🦕

chore: add SECURITY.md

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