Remove obsolete "version" value from example docker-compose.yml in README.md and from .yml files in

examples since "Compose doesn't use version to select an exact schema to validate the Compose file,
but prefers the most recent schema when it's implemented."

See: https://github.com/compose-spec/compose-spec/blob/master/04-version-and-name.md
Signed-off-by: Jeff Miller <36978574+lemondjeff@users.noreply.github.com>

README.md

@@ -25,8 +25,6 @@
 [Docker-compose](https://docs.docker.com/compose/install/) example:
 
 ```yaml
-version: "3"
-
 # More info at https://github.com/pi-hole/docker-pi-hole/ and https://docs.pi-hole.net/
 services:
   pihole:

examples/docker-compose-caddy-proxy.yml

@@ -1,5 +1,3 @@
-version: "3"
-
 services:
 
   # Caddy example derived from Caddy's own example at https://hub.docker.com/_/caddy

examples/docker-compose-nginx-proxy.yml

@@ -1,5 +1,3 @@
-version: "3"
-
 # https://github.com/pi-hole/docker-pi-hole/blob/master/README.md
 
 services:

examples/docker-compose.yml.example

@@ -1,5 +1,3 @@
-version: "3"
-
 # https://github.com/pi-hole/docker-pi-hole/blob/master/README.md
 
 services: