chore(deps): update dependency karma-coverage-istanbul-reporter to v2 (#6)

This Pull Request updates dependency [karma-coverage-istanbul-reporter](https://github.com/mattlewis92/karma-coverage-istanbul-reporter) from `v1.4.3` to `v2.0.0`

**Note**: This PR was created on a configured schedule ("before 3am on Monday") and will not receive updates outside those times.


<details>
<summary>Release Notes</summary>

### [`v2.0.0`](https://github.com/mattlewis92/karma-coverage-istanbul-reporter/blob/master/CHANGELOG.md#&#8203;200httpsgithubcommattlewis92karma-coverage-istanbul-reportercomparev143v200-2018-05-17)
[Compare Source](mattlewis92/karma-coverage-istanbul-reporter@v1.4.3...v2.0.0)
##### Features

* drop support for node 4 ([26ad3af](mattlewis92/karma-coverage-istanbul-reporter@26ad3af))
##### BREAKING CHANGES

* node 4 is no longer supported
#### [1.4.3](mattlewis92/karma-coverage-istanbul-reporter@v1.4.2...v1.4.3) (2018-05-17)
##### Bug Fixes

* **verbose:** pass the verbose option to istanbul if set ([9473517](mattlewis92/karma-coverage-istanbul-reporter@9473517)), closes [#&#8203;43](`https://github.com/mattlewis92/karma-coverage-istanbul-reporter/issues/43`)
#### [1.4.2](mattlewis92/karma-coverage-istanbul-reporter@v1.4.1...v1.4.2) (2018-03-06)
##### Bug Fixes

* all browsers should have their own output folder when not combined ([4aad40b](mattlewis92/karma-coverage-istanbul-reporter@4aad40b)), closes [#&#8203;39](`https://github.com/mattlewis92/karma-coverage-istanbul-reporter/issues/39`)
#### [1.4.1](mattlewis92/karma-coverage-istanbul-reporter@v1.4.0...v1.4.1) (2018-01-24)
##### Bug Fixes

* handle no config being set ([5483e2b](mattlewis92/karma-coverage-istanbul-reporter@5483e2b)), closes [#&#8203;36](`https://github.com/mattlewis92/karma-coverage-istanbul-reporter/issues/36`)

---

</details>




---

This PR has been generated by [Renovate Bot](https://renovatebot.com).

Author: renovate[bot]

package-lock.json

@@ -50,7 +50,7 @@
     "karma": "2.0.2",
     "rimraf": "2.6.2",
     "karma-chrome-launcher": "2.2.0",
-    "karma-coverage-istanbul-reporter": "1.4.3",
+    "karma-coverage-istanbul-reporter": "2.0.0",
     "karma-jasmine": "1.1.2",
     "karma-jasmine-html-reporter": "0.2.2",
     "karma-mocha-reporter": "2.2.5",