all: use "docker compose" not "docker-compose"

As part of the Docker binary this will be updated more often and has
better support and newer features than the separate "docker-compose"
binary.

.github/workflows/ci.yml

@@ -16,7 +16,7 @@ jobs:
     - run: echo "PATH=$GITHUB_WORKSPACE/bin:$PATH" >> $GITHUB_ENV
     - name: Run tests
       run: |
-        docker-compose up -d
+        docker compose up -d
         go vet ./...
         go run honnef.co/go/tools/cmd/staticcheck@latest ./...
         go test -race -v ./...

README.md

@@ -88,7 +88,7 @@ Unit tests expect Consul and a set of NSQ daemons to be running. Start them
 using Docker Compose, and then run unit tests.
 
 ```shell
-docker-compose up -d
+docker compose up -d
 go test -v -race ./...
-docker-compose down
+docker compose down
 ```