More setup.py fixes (openai#2321)

* move cloud pickle

* more fixes

* move cloud pickle back

requirements.txt

@@ -2,8 +2,8 @@ atari-py==0.2.6
 opencv-python>=3.
 box2d-py~=2.3.5
 mujoco_py>=1.50, <2.0
-imageio
-scipy
+scipy>=1.4.1
 numpy>=1.18.0
 pyglet>=1.4.0
-cloudpickle>=1.2.0,<1.7.0
+cloudpickle>=1.2.0
+lz4>=3.1.0

setup.py

@@ -12,10 +12,10 @@
     "atari": ["atari-py==0.2.6", "opencv-python>=3."],
     "box2d": ["box2d-py~=2.3.5", "pyglet>=1.4.0"],
     "classic_control": ["pyglet>=1.4.0"],
-    "mujoco": ["mujoco_py>=1.50, <2.0", "imageio"],
-    "robotics": ["mujoco_py>=1.50, <2.0", "imageio"],
-    "toy_text": ["scipy"],
-    "wrappers": ["lz4~=3.1", "opencv-python>=3."],
+    "mujoco": ["mujoco_py>=1.50, <2.0"],
+    "robotics": ["mujoco_py>=1.50, <2.0"],
+    "toy_text": ["scipy>=1.4.1"],
+    "wrappers": ["lz4>=3.1.0", "opencv-python>=3."],
 }
 
 # Meta dependency groups.
@@ -34,16 +34,16 @@
 setup(
     name="gym",
     version=VERSION,
-    description="The OpenAI Gym: A toolkit for developing and comparing your reinforcement learning agents.",
+    description="Gym: A universal API for reinforcement learning environments.",
     url="https://github.com/openai/gym",
     author="OpenAI",
-    author_email="[email protected]",
+    author_email="[email protected]",
     license="",
     packages=[package for package in find_packages() if package.startswith("gym")],
     zip_safe=False,
     install_requires=[
         "numpy>=1.18.0",
-        "cloudpickle>=1.2.0,<1.7.0",
+        "cloudpickle>=1.2.0",
     ],
     extras_require=extras,
     package_data={