feat(deps): bump rollup-plugin-json from 3.0.0 to 3.1.0 (#45)

Bumps [rollup-plugin-json](https://github.com/rollup/rollup-plugin-json) from 3.0.0 to 3.1.0.
<details>
<summary>Changelog</summary>

*Sourced from [rollup-plugin-json's changelog](https://github.com/rollup/rollup-plugin-json/blob/master/CHANGELOG.md).*

> ## 3.1.0
> *2018-09-13*
> * Expose "compact" and "namedExports" options ([#45](https://github-redirect.dependabot.com/rollup/rollup-plugin-json/issues/45))
> * Update rollup-pluginutils to support null values in JSON ([#44](https://github-redirect.dependabot.com/rollup/rollup-plugin-json/issues/44))
> * Update dependencies and ensure rollup@1.0 compatibility ([#46](https://github-redirect.dependabot.com/rollup/rollup-plugin-json/issues/46))
</details>
<details>
<summary>Commits</summary>

- [`bb64f65`](rollup/rollup-plugin-json@bb64f65) 3.1.0
- [`97615d6`](rollup/rollup-plugin-json@97615d6) Update changelog
- [`1bcf81b`](rollup/rollup-plugin-json@1bcf81b) Update dependencies and make tests rollup1.0 compatible ([#46](https://github-redirect.dependabot.com/rollup/rollup-plugin-json/issues/46))
- [`4df5395`](rollup/rollup-plugin-json@4df5395) Update changelog
- [`2a528e3`](rollup/rollup-plugin-json@2a528e3) Expose the "compact" and "namedExports" options ([#45](https://github-redirect.dependabot.com/rollup/rollup-plugin-json/issues/45))
- [`e9c01b9`](rollup/rollup-plugin-json@e9c01b9) Update changelog
- [`8de10c0`](rollup/rollup-plugin-json@8de10c0) Update rollup-pluginutils to support null values in json ([#44](https://github-redirect.dependabot.com/rollup/rollup-plugin-json/issues/44))
- See full diff in [compare view](rollup/rollup-plugin-json@v3.0.0...v3.1.0)
</details>
<br />

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</details>

yarn.lock

@@ -7308,11 +7308,11 @@ rollup-plugin-commonjs@^9.1.6:
     rollup-pluginutils "^2.0.1"
 
 rollup-plugin-json@^3.0.0:
-  version "3.0.0"
-  resolved "https://registry.yarnpkg.com/rollup-plugin-json/-/rollup-plugin-json-3.0.0.tgz#aeed2ff36e6c4fd0c60c4a8fc3d0884479e9dfce"
-  integrity sha512-WUAV9/I/uFWvHhyRTqFb+3SIapjISFJS7R1xN/cXxWESrfYo9I8ncHI7AxJHflKRXhBVSv7revBVJh2wvhWh5w==
+  version "3.1.0"
+  resolved "https://registry.yarnpkg.com/rollup-plugin-json/-/rollup-plugin-json-3.1.0.tgz#7c1daf60c46bc21021ea016bd00863561a03321b"
+  integrity sha512-BlYk5VspvGpjz7lAwArVzBXR60JK+4EKtPkCHouAWg39obk9S61hZYJDBfMK+oitPdoe11i69TlxKlMQNFC/Uw==
   dependencies:
-    rollup-pluginutils "^2.2.0"
+    rollup-pluginutils "^2.3.1"
 
 rollup-plugin-node-builtins@^2.1.2:
   version "2.1.2"
@@ -7390,7 +7390,7 @@ rollup-pluginutils@^1.5.0:
     estree-walker "^0.2.1"
     minimatch "^3.0.2"
 
-rollup-pluginutils@^2.0.1, rollup-pluginutils@^2.2.0, rollup-pluginutils@^2.3.1:
+rollup-pluginutils@^2.0.1, rollup-pluginutils@^2.3.1:
   version "2.3.1"
   resolved "https://registry.yarnpkg.com/rollup-pluginutils/-/rollup-pluginutils-2.3.1.tgz#760d185ccc237dedc12d7ae48c6bcd127b4892d0"
   integrity sha512-JZS8aJMHEHhqmY2QVPMXwKP6lsD1ShkrcGYjhAIvqKKdXQyPHw/9NF0tl3On/xOJ4ACkxfeG7AF+chfCN1NpBg==