chore(deps): update dependency @types/node to v8.9.0

Author: renovate-bot

package.json

@@ -21,7 +21,7 @@
     "npm-run": "4.1.2"
   },
   "devDependencies": {
-    "@types/node": "8.5.7",
+    "@types/node": "8.9.0",
     "rimraf": "2.6.2",
     "ts-node": "4.1.0",
     "typescript": "2.6.2"

yarn.lock

@@ -2,9 +2,9 @@
 # yarn lockfile v1
 
 
-"@types/node@8.5.7":
-  version "8.5.7"
-  resolved "https://registry.yarnpkg.com/@types/node/-/node-8.5.7.tgz#9c498c35af354dcfbca3790fb2e81129e93cf0e2"
+"@types/node@8.9.0":
+  version "8.9.0"
+  resolved "https://registry.yarnpkg.com/@types/node/-/node-8.9.0.tgz#99449266e9f023cc3ad5de304d759de787d18ea4"
 
 "@types/strip-bom@^3.0.0":
   version "3.0.0"