Merge pull request #30 from traveltime-dev/readme-update

Update README to not include a plugin version

README.md

@@ -5,7 +5,7 @@ Plugin for Elasticsearch that allows users to filter locations using the Travelt
 We maintain separate codebases for each ElasticSearch version between 7.10 and 8.1 (inclusive), and version 5.5. They reside in the appropriate folders (e.g. the plugin for version 7.16 is in the `7.16` folder).
 
 ## Installation & configuration 
-This is a standard Elasticsearch plugin. As such it can be installed by running `elasticsearch-plugin install https://github.com/traveltime-dev/traveltime-elasticsearch-plugin/releases/download/v0.2.27/traveltime-elasticsearch-plugin_v0.2.27_8.1.0.zip`
+This is a standard Elasticsearch plugin. As such it can be installed by running `elasticsearch-plugin install https://github.com/traveltime-dev/traveltime-elasticsearch-plugin/releases/download/${PLUGIN_VERSION}/traveltime-elasticsearch-plugin_${PLUGIN_VERSION}_${ES_VERSION}.zip`, where `PLUGIN_VERSION` is the latest plugin version available at https://github.com/traveltime-dev/traveltime-elasticsearch-plugin/releases (e.g. `v0.2.35`), and `ES_VERSION` is the exact version string of the Elasticsearch instance the plugin will be installed to (e.g. `7.17.14`)
 
 To use the plugin you **must** specify the following configuration keys:
  - `traveltime.app.id`: this is you API app id.