Add has-flag dependency

Author: shawwn

poetry.lock

@@ -9,6 +9,7 @@ license = "MIT"
 
 [tool.poetry.dependencies]
 python = "^3.6"
+has-flag = "^0.1.1"
 
 [tool.poetry.dev-dependencies]
 pytest = "^5.2"

pyproject.toml

@@ -7,6 +7,9 @@
 package_data = \
 {'': ['*']}
 
+install_requires = \
+['has-flag>=0.1.1,<0.2.0']
+
 setup_kwargs = {
  'name': 'supports-color',
  'version': '0.1.0',
@@ -19,6 +22,7 @@
  'url': 'https://github.com/shawwn/supports-color-python',
  'packages': packages,
  'package_data': package_data,
+ 'install_requires': install_requires,
  'python_requires': '>=3.6,<4.0',
 }