restyled: bump black to v19.10

Mr. Outis · Mr. Outis · commit 576290a3c529 · 2019-12-16T08:13:06.000-06:00
diff --git a/.restyled.yaml b/.restyled.yaml
@@ -1,7 +1,7 @@
 ---
 restylers:
   - name: black
-    image: restyled/restyler-black:v19.3b0
+    image: restyled/restyler-black:v19.10b0
     command:
     - black
     arguments: []
