chore(deps): update dependency google-cloud-bigquery-datatransfer to v1 [(#3208)](GoogleCloudPlatform/python-docs-samples#3208)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [google-cloud-bigquery-datatransfer](https://togithub.com/googleapis/python-bigquery-datatransfer) | major | `==0.4.1` -> `==1.0.0` |

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### Release Notes

<details>
<summary>googleapis/python-bigquery-datatransfer</summary>

### [`v1.0.0`](https://togithub.com/googleapis/python-bigquery-datatransfer/blob/master/CHANGELOG.md#&#8203;100-httpswwwgithubcomgoogleapispython-bigquery-datatransfercomparev041v100-2020-03-04)

[Compare Source](https://togithub.com/googleapis/python-bigquery-datatransfer/compare/v0.4.1...v1.0.0)

##### Features

-   **bigquerydatatransfer:** add `service_account_name` option to transfer configs ([#&#8203;10013](https://www.github.com/googleapis/python-bigquery-datatransfer/issues/10013)) ([9ca090a](https://www.github.com/googleapis/python-bigquery-datatransfer/commit/9ca090af431092bc4286fa4443dd0dc0141f6de6))
-   **bigquerydatatransfer:** undeprecate resource name helper methods; add py2 deprecation warning; bump copyright year to 2020 (via synth) ([#&#8203;10226](https://www.github.com/googleapis/python-bigquery-datatransfer/issues/10226)) ([c0f9cc3](https://www.github.com/googleapis/python-bigquery-datatransfer/commit/c0f9cc398e5558002c79a875809bb6cd1a98a8a4))
-   set release_status to production/stable ([#&#8203;15](https://www.github.com/googleapis/python-bigquery-datatransfer/issues/15)) ([a9c1160](https://www.github.com/googleapis/python-bigquery-datatransfer/commit/a9c1160475dbc327e8cc5da3b5aee3ceaa618bd3))

##### Bug Fixes

-   **bigquery_datatransfer:** deprecate resource name helper methods (via synth) ([#&#8203;9829](https://www.github.com/googleapis/python-bigquery-datatransfer/issues/9829)) ([fc06995](https://www.github.com/googleapis/python-bigquery-datatransfer/commit/fc0699549479cc3e34e217f9e588f5128107ba89))

</details>

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samples/snippets/requirements.txt

@@ -1 +1 @@
-google-cloud-bigquery-datatransfer==0.4.1
+google-cloud-bigquery-datatransfer==1.0.0