chore(package): update @commitlint/config-conventional to version 7.0.1

Closes #11

Author: greenkeeper[bot]

package.json

@@ -26,7 +26,7 @@
   },
   "devDependencies": {
     "@commitlint/cli": "^6.1.3",
-    "@commitlint/config-conventional": "^6.1.3",
+    "@commitlint/config-conventional": "^7.0.1",
     "@semantic-release/changelog": "^2.0.1",
     "@semantic-release/git": "^4.0.1",
     "@semantic-release/github": "^4.0.0",