Update typing from 3.6.6 to 3.7.4 (#317)

Author: pyup-bot

docker/build_scripts/py36-requirements.txt

@@ -10,7 +10,7 @@ auditwheel==2.0.0 \
 pyelftools==0.25 \
     --hash=sha256:89c6da6f56280c37a5ff33468591ba9a124e17d71fe42de971818cbff46c1b24
 # this package required for auditwheel
-typing==3.6.6 \
-    --hash=sha256:a4c8473ce11a65999c8f59cb093e70686b6c84c98df58c1dae9b3b196089858a \
-    --hash=sha256:57dcf675a99b74d64dacf6fba08fb17cf7e3d5fdff53d4a30ea2a5e7e52543d4 \
-    --hash=sha256:4027c5f6127a6267a435201981ba156de91ad0d1d98e9ddc2aa173453453492d
+typing==3.7.4 \
+    --hash=sha256:38566c558a0a94d6531012c8e917b1b8518a41e418f7f15f00e129cc80162ad3 \
+    --hash=sha256:53765ec4f83a2b720214727e319607879fec4acde22c4fbb54fa2604e79e44ce \
+    --hash=sha256:84698954b4e6719e912ef9a42a2431407fe3755590831699debda6fba92aac55