fix flake

Author: francoishernandez

onmt/modules/copy_generator.py

@@ -186,7 +186,8 @@ def __init__(self, criterion, generator, tgt_vocab, normalize_by_length,
         self.tgt_vocab = tgt_vocab
         self.normalize_by_length = normalize_by_length
 
-    def _make_shard_state(self, batch, output, enc_src, enc_tgt, range_, attns):
+    def _make_shard_state(self, batch, output, enc_src, enc_tgt,
+                          range_, attns):
         """See base class for args description."""
         if getattr(batch, "alignment", None) is None:
             raise AssertionError("using -copy_attn you need to pass in "