[skip ci] README.md: update supported versions of GHC

README.md

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 > Alternatively, watch a [talk and demo](http://begriffs.com/posts/2016-01-20-ihaskell-notebook.html) showing off IHaskell features.
 
-IHaskell is a kernel for the [Jupyter project](https://jupyter.org), which allows you to use Haskell inside Jupyter frontends (including the console and notebook). It currently supports GHC 8 and 8.2. For GHC 7.10 support please use the [`GHC7`](https://github.com/gibiansky/IHaskell/releases/tag/GHC7) tag.
+IHaskell is a kernel for the [Jupyter project](https://jupyter.org), which allows you to use Haskell inside Jupyter frontends (including the console and notebook). It currently supports GHC 8, 8.2, 8.4, and 8.6. For GHC 7.10 support please use the [`GHC7`](https://github.com/gibiansky/IHaskell/releases/tag/GHC7) tag.
 
 For a tour of some IHaskell features, check out the [demo Notebook](http://nbviewer.ipython.org/github/gibiansky/IHaskell/blob/master/notebooks/IHaskell.ipynb). More example notebooks are available on the [wiki](https://github.com/gibiansky/IHaskell/wiki).
 The [wiki](https://github.com/gibiansky/IHaskell/wiki) also has more extensive documentation of IHaskell features.