chore(deps): update dependency js-green-licenses to v2 (#480)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [js-green-licenses](https://togithub.com/google/js-green-licenses) | devDependencies | major | [`^1.1.0` -> `^2.0.0`](https://renovatebot.com/diffs/npm/js-green-licenses/1.1.0/2.0.0) |

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### Release Notes

<details>
<summary>google/js-green-licenses</summary>

### [`v2.0.0`](https://togithub.com/google/js-green-licenses/blob/master/CHANGELOG.md#&#8203;200-httpswwwgithubcomgooglejs-green-licensescomparev110v200-2020-05-07)

[Compare Source](https://togithub.com/google/js-green-licenses/compare/v1.1.0...v2.0.0)

##### ⚠ BREAKING CHANGES

-   drop support for node.js 8 ([#&#8203;124](https://togithub.com/google/js-green-licenses/issues/124))

##### Bug Fixes

-   **deps:** update dependency gaxios to v3 ([#&#8203;121](https://www.github.com/google/js-green-licenses/issues/121)) ([1fdd3e4](https://www.github.com/google/js-green-licenses/commit/1fdd3e4e7ad642da55ad94b72d71049f4789310c))
-   **deps:** update dependency npm-package-arg to v7 ([#&#8203;110](https://www.github.com/google/js-green-licenses/issues/110)) ([25d0235](https://www.github.com/google/js-green-licenses/commit/25d0235d0ff996b644fe84482241bda5a4b14b2a))
-   **deps:** update dependency npm-package-arg to v8 ([#&#8203;111](https://www.github.com/google/js-green-licenses/issues/111)) ([4763858](https://www.github.com/google/js-green-licenses/commit/4763858fe10d35e2f1e944d0f4e91a309503c812))
-   add 0BSD as a valid license ([#&#8203;132](https://www.github.com/google/js-green-licenses/issues/132)) ([e4db3eb](https://www.github.com/google/js-green-licenses/commit/e4db3ebe01bf49a922f0d3a0d71d9ee4af83cdf0))

##### Build System

-   drop support for node.js 8 ([#&#8203;124](https://www.github.com/google/js-green-licenses/issues/124)) ([06283e1](https://www.github.com/google/js-green-licenses/commit/06283e10c44306f88cdb382ac9d593f4a48c0b7d))

</details>

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package.json

@@ -71,7 +71,7 @@
     "express": "^4.17.1",
     "gts": "^2.0.0",
     "hapi": "^18.1.0",
-    "js-green-licenses": "^1.1.0",
+    "js-green-licenses": "^2.0.0",
     "json-stable-stringify": "^1.0.1",
     "koa": "^2.7.0",
     "linkinator": "^2.0.0",