feat: bumped version to 0.1.9

- updates dependencies
- prefer type inference with function return
- fix typos / minor improvements
- ignore all ``*.env` files
- bumped package version to 0.1.9

.gitignore

@@ -112,7 +112,7 @@ celerybeat.pid
 *.sage.py
 
 # Environments
-.env
+*.env
 .venv
 env/
 venv/