add use of pip-tools to pin requirements

requirements.txt

@@ -0,0 +1,16 @@
+#
+# This file is autogenerated by pip-compile
+# To update, run:
+#
+#    pip-compile
+#
+asyncio-mqtt==0.8.1
+    # via hasskiosk (setup.py)
+environs==9.3.1
+    # via hasskiosk (setup.py)
+marshmallow==3.10.0
+    # via environs
+paho-mqtt==1.5.1
+    # via asyncio-mqtt
+python-dotenv==0.15.0
+    # via environs

tox.ini

@@ -56,6 +56,8 @@ deps =
     bpython
     python-language-server
     rope
+    pip-tools
+    -r{toxinidir}/requirements.txt
     {[testenv:py37]deps}
     {[testenv:security]deps}
     {[testenv:security]deps}