Build - List "pretty-hrtime" as a dev dependency in root "package.json".

Author: begincalendar

package.json

@@ -82,6 +82,7 @@
         "mocha": "latest",
         "mocha-fivemat-progress-reporter": "latest",
         "plugin-error": "latest",
+        "pretty-hrtime": "^1.0.3",
         "prex": "^0.4.3",
         "q": "latest",
         "remove-internal": "^2.9.2",