Parse error with TypeFamilyDependencies

Given the following module using TypeFamilyDependencies
```
21:21 $ cat src/Bug.hs
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE TypeFamilyDependencies #-}

module Bug where

type family F a = b | b -> a where
F A = B

data A = A
data B = B
```
GHC compiles just fine
```
✔ /tmp/stylish
21:21 $ stack exec ghc src/Bug.hs
[1 of 1] Compiling Bug ( src/Bug.hs, src/Bug.o )
```
but stylish-haskell complains
```
✔ /tmp/stylish
21:21 $ stack exec stylish-haskell src/Bug.hs
Language.Haskell.Stylish.Parse.parseModule: could not parse src/Bug.hs: ParseFailed (SrcLoc ".hs" 6 17) "Parse error: ="
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE TypeFamilyDependencies #-}

module Bug where

type family F a = b | b -> a where
F A = B

data A = A
data B = B
```