add tox to dev dependencies

.gitignore

@@ -25,6 +25,8 @@ wheels/
 .installed.cfg
 *.egg
 MANIFEST
+requirements.txt
+requirements-dev.txt
 
 # PyInstaller
 #  Usually these files are written by a python script from a template
@@ -90,6 +92,8 @@ venv/
 ENV/
 env.bak/
 venv.bak/
+.direnv
+.envrc
 
 # Spyder project settings
 .spyderproject

pyproject.toml

@@ -27,10 +27,11 @@ Homepage = "https://github.com/miguelgrinberg/microdot"
 
 [project.optional-dependencies]
 dev = [
+    "tox",
 ]
 docs = [
     "sphinx",
-    "pyjwt"
+    "pyjwt",
 ]
 
 [tool.setuptools]