Ref #38 add build script command

Signed-off-by: Krzysztof Kaźmierczyk <[email protected]>

.travis.yml

@@ -25,6 +25,7 @@ deploy:
   edge: true # opt in to dpl v2
   skip_existing: true
   distributions: "bdist_hatchling"
+  script: python -m build
   on:
    all_branches: true # For testing only. Comment once the script is running
  # tags: true # Uncomment this line to publish when the tag is created