pin envinfo version to 3.4.2 (facebook#3853)

See facebook#3837

Author: bondz

packages/create-react-app/package.json

@@ -24,7 +24,7 @@
     "chalk": "^1.1.1",
     "commander": "^2.9.0",
     "cross-spawn": "^4.0.0",
-    "envinfo": "^3.8.0",
+    "envinfo": "3.4.2",
     "fs-extra": "^1.0.0",
     "hyperquest": "^2.1.2",
     "semver": "^5.0.3",