Release v0.1.3
Release v0.1.3

enhancement:

* Add `Max` aggregation
* Allow `field` nil for `Terms` aggregation
* `Aggregation.parse`:
  * Add option `group_max`
  * Allow nested aggregations on parse
  * Allow more than one aggregation

bug fix:

* Replace non word characters from aggregation name

LoveMondays/elasticband,rafaelstz/elasticband