Add methods for minimum amount out and maximum amount in for easy calculation of transaction parameters (#23)

* First test for the best trade router

* Share the array in the recursion

* Comment

* Add comparator methods and more tests

* Fix the equalTo method on the fraction

* add a todo, rename `n`

* Best trade exact out, more tests

* Faster sorted insert

* Comment fix

* Handle insufficient reserves and input amount errors

* Test improvements, export best trade options

* Improvements to fraction, make inputOutputAmount reusable

* Make comparator more reusable

* Update the init code hash, other small tweaks

* Lint

* Use pair ABI instead of token ABI to get reserves

* Update package description
Set the prototype of our custom errors

* codepoints -> emoji

* skip the data tests

* Factory address, fix checksum warning
Co-authored-by: Noah Zinsmeister <noahwz@gmail.com>

Bump acorn from 5.7.3 to 5.7.4

Bumps [acorn](https://github.com/acornjs/acorn) from 5.7.3 to 5.7.4.
- [Release notes](https://github.com/acornjs/acorn/releases)
- [Commits](https://github.com/acornjs/acorn/compare/5.7.3...5.7.4)
Signed-off-by: dependabot[bot] <support@github.com>

... for calculating liquidity-related values

exchange address -> Token