replace 'print()' with 'output.stderr_write("\n")'

gallery_dl/update.py

@@ -12,7 +12,7 @@ import sys
 
 from .extractor.common import Extractor, Message
 from .job import DownloadJob
-from . import util, version, exception
+from . import util, version, output, exception
 
 REPOS = {
     "stable" : "mikf/gallery-dl",
@@ -143,13 +143,13 @@ class UpdateJob(DownloadJob):
     def _warning(self, msg, *args):
         if self._newline:
             self._newline = False
-            print()
+            output.stderr_write("\n")
         self.extractor.log.warning(msg, *args)
 
     def _error(self, msg, *args):
         if self._newline:
             self._newline = False
-            print()
+            output.stderr_write("\n")
         self.status |= 1
         self.extractor.log.error(msg, *args)