chore(package): update conventional-changelog-metahub to version 4.0.0

Author: greenkeeper[bot]

package.json

@@ -27,7 +27,7 @@
     "@babel/core": "^7.0.0",
     "@babel/preset-env": "^7.0.0",
     "codecov": "^3.0.0",
-    "conventional-changelog-metahub": "^3.0.0",
+    "conventional-changelog-metahub": "^4.0.0",
     "cssnano": "^4.0.0",
     "fs-extra": "^8.1.0",
     "jasmine-core": "^3.0.0",