readme: adding logentries option
@@ -162,7 +162,7 @@ configure them as something other than the defaults.
| `ECS_UPDATE_DOWNLOAD_DIR` | /cache | Where to place update tarballs within the container. | | |
| `ECS_DISABLE_METRICS` | &lt;true &#124; false&gt; | Whether to disable metrics gathering for tasks. | false | true |
| `ECS_RESERVED_MEMORY` | 32 | Memory, in MB, to reserve for use by things other than containers managed by Amazon ECS. | 0 | 0 |
-| `ECS_AVAILABLE_LOGGING_DRIVERS` | `["awslogs","fluentd","gelf","json-file","journald","splunk","syslog"]` | Which logging drivers are available on the container instance. | `["json-file"]` | `["json-file"]` |
+| `ECS_AVAILABLE_LOGGING_DRIVERS` | `["awslogs","fluentd","gelf","json-file","journald","logentries","splunk","syslog"]` | Which logging drivers are available on the container instance. | `["json-file"]` | `["json-file"]` |
| `ECS_DISABLE_PRIVILEGED` | `true` | Whether launching privileged containers is disabled on the container instance. | `false` | `false` |
| `ECS_SELINUX_CAPABLE` | `true` | Whether SELinux is available on the container instance. | `false` | `false` |
| `ECS_APPARMOR_CAPABLE` | `true` | Whether AppArmor is available on the container instance. | `false` | `false` |
