build: update dependency @types/node to v9.6.15

Author: renovate-bot

package.json

@@ -4,7 +4,7 @@
   "devDependencies": {
     "@types/fetch-mock": "6.0.1",
     "@types/jest": "22.2.3",
-    "@types/node": "9.6.14",
+    "@types/node": "9.6.15",
     "@types/prop-types": "15.5.2",
     "@types/react": "16.3.13",
     "@types/react-test-renderer": "16.0.1",

yarn.lock

@@ -137,9 +137,9 @@
   version "22.2.3"
   resolved "https://registry.yarnpkg.com/@types/jest/-/jest-22.2.3.tgz#0157c0316dc3722c43a7b71de3fdf3acbccef10d"
 
-"@types/node@9.6.14":
-  version "9.6.14"
-  resolved "https://registry.yarnpkg.com/@types/node/-/node-9.6.14.tgz#79b5167f822d5fb0fb2b5c92ca150391ae0f2542"
+"@types/node@9.6.15":
+  version "9.6.15"
+  resolved "https://registry.yarnpkg.com/@types/node/-/node-9.6.15.tgz#8a5a313ea0a43a95277235841be5d3f5fb3dfeda"
 
 "@types/prop-types@15.5.2":
   version "15.5.2"