[gaskrank] Minor change and update ChangeLog after #11685

ChangeLog

@@ -1,6 +1,7 @@
 version <unreleased>
 
 Extractors
++ [gaskrank] Add new extractor (#11685)
 * [bandcamp] Fix extraction for incomplete albums (#11727)
 * [iwara] Fix extraction (#11781)
 * [googledrive] Fix extraction on Python 3.6

youtube_dl/extractor/gaskrank.py

@@ -3,10 +3,12 @@ from __future__ import unicode_literals
 
 import re
 from .common import InfoExtractor
-from ..utils import float_or_none
+from ..utils import (
-from ..utils import int_or_none
+    float_or_none,
-from ..utils import js_to_json
+    int_or_none,
-from ..utils import unified_strdate
+    js_to_json,
+    unified_strdate,
+)
 
 
 class GaskrankIE(InfoExtractor):