Merge pull request #3 from SiftScience/kanak_add_circle_badge

Add circleci badge

Author: kanakb

README.md

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 kafka-assigner
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+[![CircleCI](https://circleci.com/gh/SiftScience/kafka-assigner.svg?style=svg)](https://circleci.com/gh/SiftScience/kafka-assigner)
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 This is a rack-aware tool for assigning Kafka partitions to brokers that minimizes data movement. It also includes the ability to inspect the current live brokers in the cluster and the current partition assignment.
 
 **Using this tool will greatly simplify operations like decommissioning a broker, adding a new broker, or replacing a broker.**