fix(package): update @semantic-release/npm to version 4.0.0 (#122)

Author: greenkeeper[bot]

package.json

@@ -64,7 +64,7 @@
   },
   "dependencies": {
     "@babel/runtime": "^7.0.0-beta.51",
-    "@semantic-release/npm": "^3.3.4",
+    "@semantic-release/npm": "^4.0.0",
     "humps": "^2.0.1",
     "lodash.pick": "^4.4.0",
     "parse-link-header": "^1.0.1",