chore(package): update @commitlint/prompt to version 7.2.1

Closes #284

Author: greenkeeper[bot]

package.json

@@ -53,7 +53,7 @@
   "devDependencies": {
     "@commitlint/cli": "^6.0.2",
     "@commitlint/config-conventional": "^6.0.2",
-    "@commitlint/prompt": "^6.0.2",
+    "@commitlint/prompt": "^7.2.1",
     "chai": "^4.1.2",
     "commitizen": "^2.9.6",
     "coveralls": "^3.0.0",