build(deps-dev): update semantic-release requirement from 15.9.7 to 1…

…5.9.8

Updates the requirements on [semantic-release](https://github.com/semantic-release/semantic-release) to permit the latest version.
- [Release notes](https://github.com/semantic-release/semantic-release/releases)
- [Commits](https://github.com/semantic-release/semantic-release/commits/v15.9.8)

Signed-off-by: dependabot[bot] <support@dependabot.com>

package.json

@@ -31,7 +31,7 @@
     "cz-conventional-changelog": "2.1.0",
     "mocha": "5.2.0",
     "nyc": "12.0.2",
-    "semantic-release": "15.9.7",
+    "semantic-release": "15.9.8",
     "standard": "11.0.1",
     "@semantic-release/changelog": "3.0.0",
     "@semantic-release/git": "7.0.1"