Poetry not installiing extras defined in dev-dependencies.

pyproject.toml

[tool.poetry]
name = "fakelibrary"
version = "0.0.0"
license = "AGPL-3.0-only"
description = "A fake python libray."
authors = ["daegontaven <8206808+daegontaven@users.noreply.github.com>"]
readme = "README.md"
repository = "https://github.com/daegontaven/fakelibrary"
documentation = "https://fakelibrary.readthedocs.io"
keywords = ["poetry", "library", "fake", "system"]
classifiers = [
    "Development Status :: 1 - Planning",
    "Intended Audience :: Developers",
    "License :: OSI Approved :: GNU Affero General Public License v3",
    "Natural Language :: English",
    "Operating System :: OS Independent",
    "Programming Language :: Python :: 3 :: Only"
]
packages = [
    { include = "fakelibrary" },
    { include = "tests" }
]


[tool.poetry.dependencies]
python = "^3.8"

[tool.poetry.dev-dependencies]
bump2version = "^1.0.0"
black = "^19.10b0"
Sphinx = { version = "^3.0.3", optional = true }
sphinx_rtd_theme = { version = "^0.4.3", optional = true }
sphinx-autorun = { version = "^1.1.1", optional = true }
pytest = {version = "^5.4.2", optional = true}
pytest-cov = {version = "^2.8.1", optional = true}
tox = {version = "^3.15.0", optional = true}
wheel = {version = "^0.34.2", optional = true}

[tool.poetry.scripts]
fakelibrary = 'fakelibrary.__main__:main'

[tool.poetry.extras]
docs = [
    "Sphinx",
    "sphinx_rtd_theme",
    "sphinx-autorun"
]
tests = [
    "pytest",
    "pytest-cov",
    "tox"
]
build_tools = [
    "wheel"
]

[tool.poetry.urls]
"Bug Tracker" = "https://github.com/daegontaven/fakelibrary/issues"

[tool.black]
line-length = 79
include = '\.pyi?$'
exclude = '''
/(
    \.eggs
  | \.git
  | \.hg
  | \.mypy_cache
  | \.tox
  | \.venv
  | _build
  | buck-out
  | build
  | dist
  | tests/.*/setup.py
)/
'''

[build-system]
requires = ["poetry>=0.12"]
build-backend = "poetry.masonry.api"