chore: add two goals 'upgrade' and 'requirements'

Makefile

@@ -4,6 +4,8 @@
 # here, else it contains an empty string. The net effect is to filter out
 # whether this current run of `make` requires a Python virtual environment.
 NEED_VENV := $(or \
+  $(findstring upgrade,$(MAKECMDGOALS)), \
+  $(findstring requirements,$(MAKECMDGOALS)), \
   $(findstring all,$(MAKECMDGOALS)), \
   $(findstring quick-check,$(MAKECMDGOALS)), \
   $(findstring check,$(MAKECMDGOALS)), \
@@ -41,6 +43,20 @@ setup:
 	pre-commit install --hook-type commit-msg && \
 	pre-commit install --hook-type pre-push
 
+.PHONY: upgrade
+upgrade:
+	. .venv/bin/activate && \
+	pip install --upgrade pip && \
+	pip install --editable .[hooks,dev,test,docs]
+	rm -fr requirements.txt && $(MAKE) requirements
+
+.PHONY: requirements
+requirements: requirements.txt
+requirements.txt:
+	. .venv/bin/activate && \
+	echo "" > requirements.txt && \
+	for p in `pip list --format freeze`; do hashin --verbose $$p; done
+
 .PHONY: all
 all: check test dist docs
 

setup.py

@@ -69,6 +69,7 @@
             "flake8-builtins==1.5.3",
             "flake8-docstrings==1.6.0",
             "flake8-rst-docstrings==0.2.5",
+            "hashin==0.17.0",
             "hypothesis==6.35.1",
             "mypy==0.931",
             "pep8-naming==0.12.1",