fix(package): update tempy to version 0.4.0

Closes #117

Author: greenkeeper[bot]

package.json

@@ -33,7 +33,7 @@
     "fs-extra": "^7.0.1",
     "joi": "^14.3.0",
     "readable-stream": "^3.1.0",
-    "tempy": "^0.2.1",
+    "tempy": "^0.4.0",
     "uglify-es": "^3.3.9"
   },
   "devDependencies": {