Remove obsolete version property from Docker Compose examples (#446)

The version property was used by Docker Compose CLI V1 which has been EOL since mid 2023.

If you use it with Docker Compose CLI V2 the following warnings are logged:

> the attribute `version` is obsolete, it will be ignored, please remove it to avoid potential confusion

See: https://docs.docker.com/reference/compose-file/version-and-name/#version-top-level-element-obsolete

Signed-off-by: Wouter Born <[email protected]>

README.md

@@ -141,8 +141,6 @@ docker run \
 Create the following `docker-compose.yml` for use of local directories and start the container with `docker compose up -d`
 
 ```yaml
-version: '2.2'
-
 services:
   openhab:
     image: "openhab/openhab:4.2.2"
@@ -164,8 +162,6 @@ services:
 Create the following `docker-compose.yml` for use of Docker volumes and start the container with `docker compose up -d`
 
 ```yml
-version: '2.2'
-
 services:
   openhab:
     image: "openhab/openhab:4.2.2"
@@ -199,8 +195,6 @@ This allows for using the *Amazon Dash Button Binding* in the Docker container.
 Create the following `docker-compose.yml` and start the container with `docker compose up -d`
 
 ```yaml
-version: '2.2'
-
 services:
   openhab:
     container_name: openhab
@@ -224,8 +218,6 @@ The `host` networking driver only works on Linux hosts, and is not supported by
 On Windows and macOS ports should be exposed by adding port options to commands (`-p 8080`) or by adding a ports section to `docker-compose.yml`.
 
 ```yaml
-version: '2.2'
-
 services:
   openhab:
     image: "openhab/openhab:4.2.2"