Update readme

Author: 5k4nd

README.md

@@ -11,7 +11,7 @@ This is a multi bucket aggregation.
 Installation
 ------------
 
-`bin/plugin --install path_hierarchy --url "https://github.com/opendatasoft/elasticsearch-aggregation-pathhierarchy/releases/download/v6.4.1.0/elasticsearch-aggregation-pathhierarchy-6.4.1.0.zip"`
+`bin/plugin --install path_hierarchy --url "https://github.com/opendatasoft/elasticsearch-aggregation-pathhierarchy/releases/download/v6.4.2.0/elasticsearch-aggregation-pathhierarchy-6.4.2.0.zip"`
 
 
 Usage
@@ -273,7 +273,7 @@ To install it, launch this command in Elasticsearch directory replacing the url
 | 6.1.4 | 6.1.4.0 | https://github.com/opendatasoft/elasticsearch-aggregation-pathhierarchy/releases/download/v6.1.4.0/elasticsearch-aggregation-pathhierarchy-6.1.4.0.zip |
 | 6.2.4 | 6.2.4.0 | https://github.com/opendatasoft/elasticsearch-aggregation-pathhierarchy/releases/download/v6.2.4.0/elasticsearch-aggregation-pathhierarchy-6.2.4.0.zip |
 | 6.3.2 | 6.3.2.0 | https://github.com/opendatasoft/elasticsearch-aggregation-pathhierarchy/releases/download/v6.3.2.0/elasticsearch-aggregation-pathhierarchy-6.3.2.0.zip |
-| 6.4.1 | 6.4.1.0 | https://github.com/opendatasoft/elasticsearch-aggregation-pathhierarchy/releases/download/v6.4.1.0/elasticsearch-aggregation-pathhierarchy-6.4.1.0.zip |
+| 6.4.2 | 6.4.2.0 | https://github.com/opendatasoft/elasticsearch-aggregation-pathhierarchy/releases/download/v6.4.2.0/elasticsearch-aggregation-pathhierarchy-6.4.2.0.zip |
 
 
 License