[extractors] Add forgotten import for espn:article

youtube_dl/extractor/extractors.py

@@ -267,7 +267,10 @@ from .engadget import EngadgetIE
 from .eporner import EpornerIE
 from .eroprofile import EroProfileIE
 from .escapist import EscapistIE
-from .espn import ESPNIE
+from .espn import (
+    ESPNIE,
+    ESPNArticleIE,
+)
 from .esri import EsriVideoIE
 from .europa import EuropaIE
 from .everyonesmixtape import EveryonesMixtapeIE