Fix tests

Author: pradel

package.json

@@ -24,7 +24,7 @@
   "devDependencies": {
     "@accounts/tslint-config-accounts": "^0.0.6",
     "@types/jest": "^21.1.5",
-    "@types/node": "^8.0.47",
+    "@types/node": "8.0.47",
     "codecov": "^3.0.0",
     "flow-bin": "0.41.0",
     "jest": "^21.2.1",

yarn.lock

@@ -13,9 +13,9 @@
   version "21.1.10"
   resolved "https://registry.yarnpkg.com/@types/jest/-/jest-21.1.10.tgz#dcacb5217ddf997a090cc822bba219b4b2fd7984"
 
-"@types/node@^8.0.47":
-  version "8.9.4"
-  resolved "https://registry.yarnpkg.com/@types/node/-/node-8.9.4.tgz#dfd327582a06c114eb6e0441fa3d6fab35edad48"
+"@types/[email protected]":
+  version "8.0.47"
+  resolved "https://registry.yarnpkg.com/@types/node/-/node-8.0.47.tgz#968e596f91acd59069054558a00708c445ca30c2"
 
 JSONStream@^1.0.4:
   version "1.3.2"