chore(package): update conventional-changelog-cli to version 2.0.21

Closes #32

Author: greenkeeper[bot]

package.json

@@ -63,7 +63,7 @@
     "babel-preset-stage-2": "^6.22.0",
     "babel-register": "^6.16.3",
     "commitizen": "^2.8.6",
-    "conventional-changelog-cli": "^1.2.0",
+    "conventional-changelog-cli": "^2.0.21",
     "coveralls": "^2.11.14",
     "cz-conventional-changelog": "^1.2.0",
     "eslint": "^3.14.0",