build(package): update commitlint packages

Author: kchadha

package.json

@@ -26,9 +26,9 @@
     "gzip-js": "0.3.2"
   },
   "devDependencies": {
-    "@commitlint/cli": "6.1.0",
-    "@commitlint/config-conventional": "6.1.0",
-    "@commitlint/travis-cli": "6.1.0",
+    "@commitlint/cli": "7.2.1",
+    "@commitlint/config-conventional": "7.1.2",
+    "@commitlint/travis-cli": "7.2.1",
     "babel-eslint": "8.2.2",
     "benchmark": "^2.1.1",
     "cz-conventional-changelog": "^2.1.0",