Update pretty-bytes to the latest version 🚀 (#14)

Author: greenkeeper[bot]

package.json

@@ -38,7 +38,7 @@
     "eslint-config-xo-lukechilds": "^1.0.0",
     "minimist": "^1.2.0",
     "nyc": "^11.0.2",
-    "pretty-bytes": "^4.0.2",
+    "pretty-bytes": "^5.0.0",
     "time-span": "^2.0.0",
     "xo": "^0.19.0"
   }