Log Message:
Update to void-0.7.3

0.7.3 [2019.05.10]
* Backport the Lift Void instance introduced in
  template-haskell-2.15.0.0.

0.7.2
* Only depend on deepseq, hashable, and semigroups if using GHC 7.8 or
  earlier.
* Cleaned up spurious "redundant constraint" warnings on GHC 8+

0.7.1
* Support semigroups 0.17 on older GHCs
* Backported NFData's semigroup instance to older GHCs.

0.7
* adapt to Data.Void being moved into base-4.8
* vacuousM removed