Dropped poetry.lock and reinstalled to remove dataclasses version issue

Author: kierandarcy

poetry.lock

@@ -33,7 +33,7 @@ black = "20.8b1"
 pre-commit = "~1.17.0"
 tox-gh-actions = "^1.3.0"
 # https://github.com/python-poetry/poetry/issues/2386
-dataclasses = { version = "^0.7", python = "^3.6.1, <3.7" }
+dataclasses = { version = "^0.6", python = "^3.6.1, <3.7" }
 
 [build-system]
 requires = ["poetry>=0.12"]