major: update default container name (#72)

The previous default container name `localstack_main` is not a valid URL, so
we rename the default to `localstack-main`.

See localstack/localstack#9469.

Author: simonrw

.circleci/config.yml

@@ -16,15 +16,15 @@ jobs:
       - run:
           name: Deploy app and run test request
           command: |
-            docker logs localstack_main
+            docker logs localstack-main
             awslocal s3 mb s3://test123
             awslocal s3 ls
             make install
             make deploy
             make web &
             make send-request
             code=$?
-            docker logs localstack_main
+            docker logs localstack-main
             exit $code
 
 workflows: