chore(package): update @commitlint/config-conventional to version 8.0.0 (#268)

Author: greenkeeper[bot]

package.json

@@ -29,7 +29,7 @@
   },
   "devDependencies": {
     "@commitlint/cli": "^8.0.0",
-    "@commitlint/config-conventional": "^7.5.0",
+    "@commitlint/config-conventional": "^8.0.0",
     "@types/jest": "^24.0.12",
     "codecov": "^3.4.0",
     "generate-changelog": "^1.7.1",