chore(package): update licensor to version 4.0.0 (#81)

Author: greenkeeper[bot]

package.json

@@ -57,7 +57,7 @@
     "husky": "^0.14.0",
     "in-publish": "^2.0.0",
     "jest": "^20.0.0",
-    "licensor": "^3.1.0",
+    "licensor": "^4.0.0",
     "lint-staged": "^4.0.0",
     "prettier": "^1.1.0",
     "webpack": "^3.0.0"