Add flake8-comprehensions to nox check task (#200)

* fixed as flake8-comprehensions

* added site folder into gitignore

.gitignore

@@ -4,6 +4,7 @@
 .mypy_cache/
 __pycache__/
 htmlcov/
+site/
 *.egg-info/
 venv/
 .nox

httpx/client.py

@@ -207,7 +207,7 @@ class BaseClient:
             # will raise redirect errors if appropriate.
             if len(history) > self.max_redirects:
                 raise TooManyRedirects(response=history[-1])
-            if request.url in [response.url for response in history]:
+            if request.url in (response.url for response in history):
                 raise RedirectLoop(response=history[-1])
 
             response = await self.dispatch.send(

noxfile.py

@@ -28,7 +28,9 @@ def lint(session):
 
 @nox.session(reuse_venv=True)
 def check(session):
-    session.install("black", "flake8", "flake8-bugbear", "mypy")
+    session.install(
+        "black", "flake8", "flake8-bugbear", "flake8-comprehensions", "mypy"
+    )
 
     session.run("black", "--check", "--target-version=py36", *source_files)
     session.run(