[piksel] Add new extractor(closes #11246)

youtube_dl/extractor/extractors.py

@@ -699,6 +699,7 @@ from .periscope import (
 from .philharmoniedeparis import PhilharmonieDeParisIE
 from .phoenix import PhoenixIE
 from .photobucket import PhotobucketIE
+from .piksel import PikselIE
 from .pinkbike import PinkbikeIE
 from .pladform import PladformIE
 from .playfm import PlayFMIE