Update README

Author: ctmay4

README.md

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 # seerapi-client-java
-[![CircleCI](https://circleci.com/gh/imsweb/seerapi-client-java.svg?style=svg)](https://circleci.com/gh/imsweb/seerapi-client-java)
+[![CircleCI](https://circleci.com/gh/imsweb/seerapi-client-java.svg?style=shield)](https://circleci.com/gh/imsweb/seerapi-client-java)
 [![Maven Central](https://maven-badges.herokuapp.com/maven-central/com.imsweb/seerapi-client-java/badge.svg)](https://maven-badges.herokuapp.com/maven-central/com.imsweb/seerapi-client-java)
 
 A [SEER*API](https://api.seer.cancer.gov) client for Java applications.  This library supports most of the APIs and