feat(deps): bump

BREAKING CHANGE: Use conventional-changelog^0.5.0

Author: stevemao

package.json

@@ -26,13 +26,13 @@
     "log"
   ],
   "dependencies": {
-    "conventional-changelog": "^0.4.0",
+    "conventional-changelog": "^0.5.0",
     "dateformat": "^1.0.11",
     "git-semver-tags": "^1.0.0",
     "github": "^0.2.4",
     "lodash.merge": "^3.3.2",
     "meow": "^3.3.0",
-    "object-assign": "^3.0.0",
+    "object-assign": "^4.0.1",
     "q": "^1.4.1",
     "semver": "^5.0.1",
     "through2": "^2.0.0"