Add badges to README (close #73)

Author: chuwy

README.md

@@ -1,5 +1,9 @@
 # Snowplow Elasticsearch Loader
 
+[![Build Status][travis-image]][travis]
+[![Release][release-image]][releases]
+[![License][license-image]][license]
+
 ## Introduction
 
 The Snowplow Elasticsearch Loader consumes Snowplow enriched events or failed events from an
@@ -71,6 +75,16 @@ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 
+
+[travis-image]: https://travis-ci.org/snowplow/snowplow-elasticsearch-loader.png?branch=master
+[travis]: http://travis-ci.org/snowplow/snowplow-elasticsearch-loader
+
+[release-image]: https://api.bintray.com/packages/snowplow/registry/snowplow%3Aelasticsearch-loader/images/download.svg
+[releases]: https://bintray.com/snowplow/registry/snowplow%3Aelasticsearch-loader/_latestVersion
+
+[license-image]: http://img.shields.io/badge/license-Apache--2-blue.svg?style=flat
+[license]: http://www.apache.org/licenses/LICENSE
+
 [kinesis]: http://aws.amazon.com/kinesis/
 [nsq]: http://nsq.io
 [snowplow]: http://snowplowanalytics.com