chore(deps): update dependency google-cloud-translate to v3 (GoogleCloudPlatform#4720)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [google-cloud-translate](https://togithub.com/googleapis/python-translate) | major | `==2.0.2` -> `==3.0.1` |

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### Release Notes


googleapis/python-translate

### [`v3.0.1`](https://togithub.com/googleapis/python-translate/blob/master/CHANGELOG.md#​301-httpswwwgithubcomgoogleapispython-translatecomparev300v301-2020-08-08)

[Compare Source](https://togithub.com/googleapis/python-translate/compare/v3.0.0...v3.0.1)

### [`v3.0.0`](https://togithub.com/googleapis/python-translate/blob/master/CHANGELOG.md#​300-httpswwwgithubcomgoogleapispython-translatecomparev202v300-2020-08-05)

[Compare Source](https://togithub.com/googleapis/python-translate/compare/v2.0.2...v3.0.0)

##### ⚠ BREAKING CHANGES

-   migrate API to microgenerator ([#&GoogleCloudPlatform#8203;31](https://togithub.com/googleapis/python-translate/issues/31))

##### Features

-   migrate API to microgenerator ([#&GoogleCloudPlatform#8203;31](https://www.github.com/googleapis/python-translate/issues/31)) ([1c5b6e8](https://www.github.com/googleapis/python-translate/commit/1c5b6e89a0a3b55c41c909e4ee27e0bd23e4b579))

##### [2.0.2](https://www.github.com/googleapis/python-translate/compare/v2.0.1...v2.0.2) (2020-08-03)

##### Bug Fixes

-   refactored MP3 file creation test for Hybrid glossaries samples [(\[#&GoogleCloudPlatform#8203;2379\](https://www.github.com/googleapis/python-translate/issues/2379))](https://togithub.com/GoogleCloudPlatform/python-docs-samples/issues/2379) ([b8b5101](https://www.github.com/googleapis/python-translate/commit/b8b5101be28d0d0d17a4d688eea81af6754a394c))
-   translate test [(\[#&GoogleCloudPlatform#8203;2671\](https://www.github.com/googleapis/python-translate/issues/2671))](https://togithub.com/GoogleCloudPlatform/python-docs-samples/issues/2671) ([a3d9f80](https://www.github.com/googleapis/python-translate/commit/a3d9f804576caeb4fdcdbbd4479caeb926efd8d0))
-   update default retry config ([#&GoogleCloudPlatform#8203;15](https://www.github.com/googleapis/python-translate/issues/15)) ([dddf0bf](https://www.github.com/googleapis/python-translate/commit/dddf0bf33463968932031cc0be5bc8a0d4a96455))

##### [2.0.1](https://www.github.com/googleapis/python-translate/compare/v2.0.0...v2.0.1) (2020-01-31)

##### Bug Fixes

-   **translate:**  add py2 deprecation warning; bump copyright year to 2020; add 3.8 unit tests (via synth) ([#&GoogleCloudPlatform#8203;9943](https://www.github.com/googleapis/python-translate/issues/9943)) ([b57f09a](https://www.github.com/googleapis/python-translate/commit/b57f09a5f804daca1a96918a29746f24ae7bc4a5))
-   **translate:** update test assertion and core version pins ([#&GoogleCloudPlatform#8203;10098](https://www.github.com/googleapis/python-translate/issues/10098)) ([74b7757](https://www.github.com/googleapis/python-translate/commit/74b77579a1770c743353bdafde3e1744cbbe7842))



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functions/ocr/app/requirements.txt

@@ -1,4 +1,4 @@
 google-cloud-pubsub==1.7.0
 google-cloud-storage==1.31.2
-google-cloud-translate==2.0.2
+google-cloud-translate==3.0.1
 google-cloud-vision==1.0.0