add missing aiohttp dep (#699)

add missing aiohttp dep

Also mark 3.8 as allowed to fail for now; it will fail due to an aiohttp bug.

Fixes #690

.travis.yml

@@ -33,6 +33,10 @@ matrix:
       python: 3.7
     - name: "3.8-dev"
       python: 3.8-dev
+  # aiohttp currently has a bug affecting 3.8
+  allow_failures:
+    - name: "3.8-dev"
+      python: 3.8-dev
 before_deploy:
   - pip install pyinstaller
   - pyinstaller --clean -F --add-data blib2to3/:blib2to3 black.py

setup.py

@@ -42,7 +42,7 @@ def get_version() -> str:
     python_requires=">=3.6",
     zip_safe=False,
     install_requires=["click>=6.5", "attrs>=18.1.0", "appdirs", "toml>=0.9.4"],
-    extras_require={"d": ["aiohttp>=3.3.2"]},
+    extras_require={"d": ["aiohttp>=3.3.2", "aiohttp-cors"]},
     test_suite="tests.test_black",
     classifiers=[
         "Development Status :: 4 - Beta",