Third try at black formatting

Author: evamariie

preprocessing/preprocessing_tutorial.ipynb

@@ -228,7 +228,12 @@
     "from brainles_preprocessing.brain_extraction import HDBetExtractor\n",
     "from brainles_preprocessing.modality import Modality\n",
     "from brainles_preprocessing.preprocessor import Preprocessor\n",
-    "from brainles_preprocessing.registration import ANTsRegistrator, NiftyRegRegistrator, eRegRegistrator\n",
+    "from brainles_preprocessing.registration import (\n",
+    "    ANTsRegistrator,\n",
+    "    NiftyRegRegistrator,\n",
+    "    eRegRegistrator,\n",
+    ")\n",
+    "\n",
     "# ANTSRegistrator (default), NiftyRegRegistrator (Linux), eRegRegistrator (experimental)\n",
     "\n",
     "\n",