Merge pull request #7 from la-haute-societe/features/list-command

Add a list subcommand to display a list of available environments

Author: Maxime Colin

README.md

@@ -142,6 +142,7 @@ deployator remove --environment review
 
 Again, you could specify another confguration file with the ``config`` parameter, like with the ``deploy`` command.
 
+
 ### Rollback to previous release
 
 ````sh
@@ -164,6 +165,18 @@ deployator rollback --environment review
 ````
 
 
+### List available environments
+
+````sh
+  deployator list [--config]
+
+Options:
+  --config, -c       Path of configuration file
+````
+
+This command displays the list of environments available in the configuration file.
+
+
 ## Configuration file
 
 > See all the available options on the [ssh-deploy-release documentation](https://github.com/la-haute-societe/ssh-deploy-release).