fix "text:" downloader

gallery_dl/downloader/text.py

@@ -13,7 +13,7 @@ from .common import BasicDownloader
 
 class Downloader(BasicDownloader):
 
-    def __init__(self, output):
+    def __init__(self, session, output):
         BasicDownloader.__init__(self)
         self.out = output
 

test/test_extractors.py

@@ -58,6 +58,7 @@ skip = [
     "exhentai", "kissmanga", "mangafox", "dynastyscans", "nijie",
     "archivedmoe", "archiveofsins", "thebarchive",
     # temporary issues
+    "imgtrex",  # 504
 ]
 # enable selective testing for direct calls
 if __name__ == '__main__' and len(sys.argv) > 1: