Update for Purescript 0.11

Updates to Purescript 0.11 (thanks @berdario)

No substantive changes, but it seems a major version bump is needed when dependencies experience a major version bump.

Enforce `top` and `bottom`

This version now enforces top and bottom, clamping operations that would otherwise overflow the bounds of an Int53 (see #8, thanks @hdgarrood)

It also implements degree in a way appropriate for integers (see #7, thanks @clayrat and @garyb).

The dependencies have also been updated for Purescript 0.10.5 and purescript-prelude 2.3.

Provide a `Generic` instance

We now provide a Generic instance, which might be useful in cases where an Int53 is part of a larger structure which you would like to make Generic.

Compatibility with purescript 0.9 and prelude 1.0

Version 2.0 is now compatible with purescript-prelude 1.0, and with purescript 0.9.

Add `pow` and `abs`

Version 1.1 adds the pow and abs functions.

Declare version 1

Let's call this version 1.

More documentation and badges

Tweaked the documentation and added some badges to the README.

Initial release

Initial release of new module.