Bump version in readme

Merge pull request #28 from zakird/es-5.6.3

5.6.3 support

Merge pull request #29 from chirag-jog/master

Version bump to v5.6.1

Fix malformed URL parsing bug

Fix malformed url bug

Merge pull request #26 from mathewmeconry/master

Bump Version

Merge pull request #25 from jalaziz/master

Upgrade to Elasticsearch 5.5.0

Update to ES v2.4.5

Fix version numbers in readme

Bump version number