Added TravisCI badge

Author: mmallis87

README.md

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 # DocuSign Java Client
 
+[![Build status][travis-image]][travis-url]
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 You can sign up for a free [developer sandbox](https://www.docusign.com/developer-center).
 
 Requirements
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 This version of the client library does not implement all of the DocuSign REST API methods. The current client omits methods in the Accounts, Billing, Cloud Storage, Connect, Groups (Branding), and Templates (Bulk Recipients) categories. The client's methods support the core set of use cases that most integrations will encounter. For a complete list of omitted endpoints, see [Omitted Endpoints](./omitted_endpoints.md).
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+[travis-image]: https://img.shields.io/travis/docusign/docusign-java-client.svg?style=flat
+[travis-url]: https://travis-ci.org/docusign/docusign-java-client