Merge pull request #26 from Woile/dependabot/pip/black-tw-19.3b0

chore(deps-dev): update black requirement from ^18.3-alpha.0 to ^19.3b0

Author: woile

pyproject.toml

@@ -54,7 +54,7 @@ tomlkit = "^0.5.3"
 
 [tool.poetry.dev-dependencies]
 ipython = "^7.2"
-black = "^18.3-alpha.0"
+black = "^19.3b0"
 pytest = "^4.0"
 flake8 = "^3.6"
 pytest-cov = "^2.6"