Update to tagged-0.8.6

0.8.6 [2018.07.02]
* Make the Read(1) instances for Proxy ignore the precedence argument,
  mirroring similar changes to base here.
* Fix a bug in the Floating instance for Tagged in which logBase was
  defined in terms of (**).
* Avoid incurring some dependencies when using recent GHCs.

0.8.5
* Support Data.Bifoldable/Data.Bitraversable in base for GHC 8.1+.
* Backport the Eq1, Ord1, Read1, and Show1 instances for Proxy from
  base-4.9
* Add Eq1/2, Ord1/2, Read1/2, and Show1/2 instances for Tagged

0.8.4
* Backport the Alternative, MonadPlus, and MonadZip instances for
  Proxy from base-4.9
* Add Bits, FiniteBits, IsString, and Storable instances for Tagged

0.8.3
* Manual Generic1 support to work around a bug in GHC 7.6
* Invert the dependency to supply the Semigroup instance ourselves
  when building on GHC 8

0.8.2
* deepseq support.
* Widened template-haskell dependency bounds.

0.8.1
* Add KProxy to the backwards compatibility Data.Proxy module.
* Add a Generic instance to Proxy.

0.8.0.1
* Fix builds on GHC 7.4.

0.8
* Added Data.Proxy.TH, based on the code from Frames by Anthony Cowley.
* Removed reproxy from Data.Proxy. This is a bad API decision, but it
  isn't present in GHC's Data.Proxy, and this makes the API more
  stable.

0.7.3
* Support Data.Bifunctor in base for GHC 7.9+.


(pho)