Prepare release 6.8.0.0

Author: Clément Tourrière

README.md

@@ -269,6 +269,7 @@ To install it, launch this command in Elasticsearch directory replacing the url
 | 6.5.4 | 6.5.4.1 | https://github.com/opendatasoft/elasticsearch-aggregation-pathhierarchy/releases/download/v6.5.4.1/pathhierarchy-aggregation-6.5.4.1.zip |
 | 6.6.2 | 6.6.2.0 | https://github.com/opendatasoft/elasticsearch-aggregation-pathhierarchy/releases/download/v6.6.2.0/pathhierarchy-aggregation-6.6.2.0.zip |
 | 6.7.1 | 6.7.1.1 | https://github.com/opendatasoft/elasticsearch-aggregation-pathhierarchy/releases/download/v6.7.1.1/pathhierarchy-aggregation-6.7.1.1.zip |
+| 6.8.0 | 6.8.0.0 | https://github.com/opendatasoft/elasticsearch-aggregation-pathhierarchy/releases/download/v6.8.0.0/pathhierarchy-aggregation-6.8.0.0.zip |
 | 7.0.1 | 7.0.1.0 | https://github.com/opendatasoft/elasticsearch-aggregation-pathhierarchy/releases/download/v7.0.1.0/pathhierarchy-aggregation-7.0.1.0.zip |