adds flake8 checker plugins

.flake8

@@ -1,5 +1,5 @@
 [flake8]
-ignore = E231,E203,W503,Q000,WPS111,WPS305,WPS348,WPS602,D400,DAR201,S101,DAR101,C812,D104,I001,WPS306,WPS214,D401,WPS229,WPS420,WPS230,WPS414,WPS114,WPS226,WPS442,C819,WPS601,T001,RST304
+ignore = E231,E203,W503,Q000,WPS111,WPS305,WPS348,WPS602,D400,DAR201,S101,DAR101,C812,D104,I001,WPS306,WPS214,D401,WPS229,WPS420,WPS230,WPS414,WPS114,WPS226,WPS442,C819,WPS601,T001,RST304,WPS410,WPS428,A003,A002,I003,WPS221,WPS326,WPS201,S405,DAR301,WPS210,WPS202,WPS213,WPS301,
 max-line-length = 89
 
 [isort]

Pipfile

@@ -17,3 +17,10 @@ sphinx_rtd_theme = "*"
 mypy = "*"
 black = "==19.10b0"
 codecov = "*"
+flake8-bugbear ="*"
+flake8-comprehensions ="*"
+flake8-eradicate = "*"
+flake8-broken-line = "*"
+pep8-naming = "*"
+flake8-string-format = "*"
+flake8-quotes = "*"

pytube/contrib/playlist.py

@@ -138,7 +138,7 @@ class Playlist:
     def videos(self) -> Iterable[YouTube]:
         """Yields YouTube objects of videos in this playlist
 
-        :rtype: Iterable[YouTube]
+        :Yields: YouTube
         """
         yield from (YouTube(url) for url in self.video_urls)