updating the makefile

Makefile

@@ -22,7 +22,7 @@ show:             ## Show the current environment.
 install:          ## Install the project in dev mode.
 	@if [ "$(USING_POETRY)" ]; then poetry install && exit; fi
 	@echo "Don't forget to run 'make virtualenv' if you got errors."
-	$(ENV_PREFIX)pip install -e .[test]
+	$(ENV_PREFIX)pip install -e '.[dev]'
 
 .PHONY: fmt
 fmt:              ## Format code using black & isort.