Update package.json

Get latest version of Hapi to get rid the warning
`DeprecationWarning: os.tmpDir() is deprecated. Use os.tmpdir() instead.`
hapijs/hapi#3368

Author: telvin

package.json

@@ -7,7 +7,7 @@
   "license": "MIT",
   "dependencies": {
     "core-js": "^2.4.1",
-    "hapi": "13.2.2",
+    "hapi": "*",
     "inert": "3.2.0",
     "lodash": "^4.13.1",
     "mkdirp": "0.5.1",