1.10.10

• commit 4870985 (HEAD -> 1.10.x, origin/1.10.x)
  | Author: Iggy Eom [email protected]
  | Date: Sun Jun 21 01:51:23 2020 +0900
  |
  | Bump version to 1.10.10.
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• commit 04ea476
  | Author: Iggy Eom [email protected]
  | Date: Sun Jun 21 01:50:14 2020 +0900
  |
  | Rearrange migration files.
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• commit 295caf4
  | Author: Iggy Eom [email protected]
  | Date: Wed Jun 17 16:36:07 2020 +0900
  |
  | Suppress nullable user.last_login.
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• commit b08ce46
  | Author: Iggy Eom [email protected]
  | Date: Wed May 20 16:31:47 2020 +0900
  |
  | Revert microsecond precision support.
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  | This commit partially reverts 22da5f8
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• commit fdd0bb5
  | Author: Oliver Chang [email protected]
  | Date: Sat Apr 4 16:37:18 2020 -0700
  |
  | Fixed Python 3.6 deprecation warning for empty model super() calls.
  |
  | See: django@dd99e69