Update filter.stats (#39)

Author: pomadchin

CHANGELOG.md

@@ -6,6 +6,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Changed
+- Update filter.stats [#39](https://github.com/PDAL/java/pull/39)
+
 ## [2.1.5-RC3] - 2020-03-13
 ### Fixed 
 - Fix mesh rasterizer [#38](https://github.com/PDAL/java/pull/38)

core-scala/src/main/scala/io/pdal/pipeline/PipelineExpressions.scala

@@ -759,9 +759,11 @@ case class FilterSplitter(
 
 @ConfiguredJsonCodec
 case class FilterStats(
-  dimenstions: Option[String] = None,
+  dimensions: Option[String] = None,
   enumerate: Option[String] = None,
   count: Option[Int] = None,
+  global: Option[String] = None,
+  advanced: Option[Boolean] = None,
   `type`: FilterType = FilterTypes.stats
 ) extends PipelineExpr