missing developer dependencies

Author: Diego Ardila

pyproject.toml

@@ -37,11 +37,14 @@ grequests = "^0.6.0"
 requests = "^2.25.1"
 tqdm = "^4.60.0"
 boto3 = "^1.17.53"
+mypy = "^0.812"
 
 [tool.poetry.dev-dependencies]
 poetry = "^1.1.5"
 pytest = "^6.2.3"
 pylint = "^2.7.4"
+black = "^20.8b1"
+flake8 = "^3.9.1"
 
 [build-system]
 requires = ["poetry-core>=1.0.0"]