fix requirements (#301)

* fix requirements

* fix mkdir bug

paddlehub/common/dir.py

@@ -43,7 +43,7 @@ THIRD_PARTY_HOME = os.path.join(gen_hub_home(), "thirdparty")
 TMP_HOME = os.path.join(gen_hub_home(), "tmp")
 
 if not os.path.exists(TMP_HOME):
-    os.mkdir(TMP_HOME)
+    os.makedirs(TMP_HOME)
 
 
 @contextlib.contextmanager

requirements.txt

@@ -26,3 +26,6 @@ pandas < 0.25.0 ; python_version < "3"
 
 # gunicorn not support windows
 gunicorn >= 19.10.0; sys_platform != "win32"
+
+# moviepy 1.0.1 not support imageio>2.5
+moviepy < 1.0.0 ; python_version < "3"