remove project travis ci

Signed-off-by: Kang Huaishuai <khs1994@khs1994.com>

docker-compose.yml

@@ -21,7 +21,7 @@ services:
 
   # $ docker run -it --rm -p 4000:80 dockerpracticesig/docker_practice
   offline:
-    # this image build by travis ci
+    # this image build by GitHub Action
     image: dockerpracticesig/docker_practice
     ports:
       - 4000:80