feat: add placement groups

- documentation
- update readme for next version

README.md

@@ -15,8 +15,8 @@ You can find sources and pre-compiled binaries [here](https://github.com/JonasPr
 
 ```bash
 # Download the binary (this example downloads the binary for linux amd64)
-$ wget https://github.com/JonasProgrammer/docker-machine-driver-hetzner/releases/download/3.4.0/docker-machine-driver-hetzner_3.4.0_linux_amd64.tar.gz
-$ tar -xvf docker-machine-driver-hetzner_3.4.0_linux_amd64.tar.gz
+$ wget https://github.com/JonasProgrammer/docker-machine-driver-hetzner/releases/download/3.5.0/docker-machine-driver-hetzner_3.5.0_linux_amd64.tar.gz
+$ tar -xvf docker-machine-driver-hetzner_3.5.0_linux_amd64.tar.gz
 
 # Make it executable and copy the binary in a directory accessible with your $PATH
 $ chmod +x docker-machine-driver-hetzner
@@ -106,6 +106,8 @@ $ docker-machine create \
 - `--hetzner-firewalls`: Firewall IDs or names which should be applied on the server
 - `--hetzner-server-label`: `key=value` pairs of additional metadata to assign to the server.
 - `--hetzner-key-label`: `key=value` pairs of additional metadata to assign to SSH key (only applies if newly creadted).
+- `--hetzner-placement-group`: Add to a placement group by name or ID; a spread-group will be created on demand if it does not exist
+- `--hetzner-auto-spread`: Add to a `docker-machine` provided `spread` group (mutually exclusive with `--hetzner-placement-group`)
 
 #### Existing SSH keys
 
@@ -141,6 +143,8 @@ was used during creation.
 | `--hetzner-use-private-network`     | `HETZNER_USE_PRIVATE_NETWORK`     | false                      |
 | `--hetzner-server-label`            | (inoperative)                     | `[]`                       |
 | `--hetzner-key-label`               | (inoperative)                     | `[]`                       |
+| `--hetzner-placement-group`         | `HETZNER_PLACEMENT_GROUP`         | -                          |
+| `--hetzner-auto-spread`             | `HETZNER_AUTO_SPREAD`             | false                      |
 
 ## Building from source