Bump decimal from 1.7.0 to 1.8.0

[dependabot-preview[bot]]

Bumps decimal from 1.7.0 to 1.8.0.

Changelog

*Sourced from [decimal's changelog](https://github.com/ericmj/decimal/blob/master/CHANGELOG.md).* > ## v1.8.0 (2019-06-24) > > ### Enhancements > > * Add `Decimal.cast/1` > * Add `Decimal.eq?/2`, `Decimal.gt?/2`, and `Decimal.lt?/2` > * Add guards to `Decimal.new/3` to prevent invalid Decimal numbers

Commits

- [`0da6d3c`](https://github.com/ericmj/decimal/commit/0da6d3c2fd8c45117e7d6ccbf56275e2c057f40c) Release v1.8.0 - [`9ab0d29`](https://github.com/ericmj/decimal/commit/9ab0d29a14e00e1551866ac5725d2232b21bffd5) Allow zero coef in new/3 - [`9fc7ea5`](https://github.com/ericmj/decimal/commit/9fc7ea5864a1b64f605c12e8b230c04e3d9b8906) Rename from_any/1 to cast/1 ([#123](https://github-redirect.dependabot.com/ericmj/decimal/issues/123)) - [`136d50f`](https://github.com/ericmj/decimal/commit/136d50f346f4079f47fb4835b70c27f419781bf8) Add guards to new/3 - [`db34cfd`](https://github.com/ericmj/decimal/commit/db34cfd273006d594da9f30d7c1aadd93af919ca) Bump to v1.8.0-dev - [`26a4187`](https://github.com/ericmj/decimal/commit/26a41874a19b43007caad8fe1d3b6b31ef85b2f2) Add eq?/2, gt?/2, and lt?/2 ([#121](https://github-redirect.dependabot.com/ericmj/decimal/issues/121)) - [`8ebe1f8`](https://github.com/ericmj/decimal/commit/8ebe1f8273c26d48339956d71a11ed1af0b7e00d) update tests and docs to reflect from_any/1 accepting decimal input ([#118](https://github-redirect.dependabot.com/ericmj/decimal/issues/118)) - [`af14a72`](https://github.com/ericmj/decimal/commit/af14a726fc5d778405803b75362b8dfc053aef0b) Add Decimal.from_any/1 ([#116](https://github-redirect.dependabot.com/ericmj/decimal/issues/116)) - [`6df3652`](https://github.com/ericmj/decimal/commit/6df3652713261a170e702c046d7b39666215c693) Update ex_doc - [`a2389dd`](https://github.com/ericmj/decimal/commit/a2389dd741c89976d1995d26754f83263630fc52) Add `:xsd` to typespecs ([#114](https://github-redirect.dependabot.com/ericmj/decimal/issues/114)) - Additional commits viewable in [compare view](https://github.com/ericmj/decimal/compare/v1.7.0...v1.8.0)

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[dependabot-preview[bot]]

Looks like decimal is up-to-date now, so this is no longer needed.