double-extra-0.1.0.1: README.md

# double-extra
Missing presentations for Double numbers (fixed, scientific etc.)

please use `coerce` to convert from double before presenting

```haskell
DoublePrecision (i :: Nat)
DoubleExponential (i :: Nat)
DoubleFixed (i :: Nat)
DoubleShortest
```

# Please Note

For GHCJS you need to use the settings from stack till https://github.com/bos/double-conversion/pull/16