Release 0.6.0

1. Cpu utilization calculation has been fixed to now use timestamps associated with the data to compute the elapsed time between successive fetches. With this change, Task Ranker is now stateful as cpuutil task ranking strategy stores the previous values of cumulative cpu time.
2. Implemented hooks to be used with logrus for logging purposes. Task Ranker does not log to the console to avoid mixing task ranker logs with application logs. Instead, task ranker logs to two log files.
   • Task Ranker logs specific its functioning.
   • Task Ranking Results logs containing the results of executing the configured task ranking strategy on the data fetched from prometheus.