Fix failed build and add websockets version specifier (#1239)

* add websockets version constraint

* fix failed build

requirements.txt

@@ -2,4 +2,4 @@ aiofiles
 httptools
 ujson; sys_platform != "win32" and implementation_name == "cpython"
 uvloop; sys_platform != "win32" and implementation_name == "cpython"
-websockets
+websockets>=4.0,<5.0

setup.py

@@ -60,7 +60,7 @@ requirements = [
     uvloop,
     ujson,
     'aiofiles>=0.3.0',
-    'websockets>=4.0',
+    'websockets>=4.0,<5.0',
 ]
 if strtobool(os.environ.get("SANIC_NO_UJSON", "no")):
     print("Installing without uJSON")

tox.ini

@@ -12,7 +12,7 @@ deps =
     pytest-cov
     pytest-sanic
     pytest-sugar
-    aiohttp>=2.3
+    aiohttp>=2.3,<=3.2.1
     chardet<=2.3.0
     beautifulsoup4
     gunicorn