Bump bignumber.js from 3.0.1 to 9.0.0

[dependabot-preview]

Bumps bignumber.js from 3.0.1 to 9.0.0.

Changelog

Sourced from bignumber.js's changelog.

9.0.0

• 27/05/2019
• For compatibility with legacy browsers, remove Symbol references.

8.1.1

• 24/02/2019
• [BUGFIX] #222 Restore missing var to export BigNumber.
• Allow any key in BigNumber.Instance in bignumber.d.ts.

8.1.0

• 23/02/2019
• [NEW FEATURE] #220 Create a BigNumber using {s, e, c}.
• [NEW FEATURE] isBigNumber: if BigNumber.DEBUG is true, also check that the BigNumber instance is well-formed.
• Remove instanceof checks; just use _isBigNumber to identify a BigNumber instance.
• Add _isBigNumber to prototype in bignumber.mjs.
• Add tests for BigNumber creation from object.
• Update API.html.

8.0.2

• 13/01/2019
• #209 toPrecision without argument should follow toString.
• Improve Use section of README.
• Optimise toString(10).
• Add verson number to API doc.

8.0.1

• 01/11/2018
• Rest parameter must be array type in bignumber.d.ts.

8.0.0

• 01/11/2018
• [NEW FEATURE] Add BigNumber.sum method.
• [NEW FEATURE]toFormat: add prefix and suffix options.
• [NEW FEATURE] #178 Pass custom formatting to toFormat.
• [BREAKING CHANGE] #184 toFraction: return array of BigNumbers not strings.
• [NEW FEATURE] #185 Enable overwrite of valueOf to prevent accidental addition to string.
• #183 Add Node.js crypto requirement to documentation.
• [BREAKING CHANGE] #198 Disallow signs and whitespace in custom alphabet.
• [NEW FEATURE] #188 Implement util.inspect.custom for Node.js REPL.
• #170 Make isBigNumber a type guard in bignumber.d.ts.
• [BREAKING CHANGE] BigNumber.min and BigNumber.max: don't accept an array.
• Update .travis.yml.
• Remove bower.json.

7.2.1

• 24/05/2018
• Add browser field to package.json.

7.2.0

• 22/05/2018

... (truncated)

Commits

• 986fd70 v9.0.0
• 97a83d7 For compatibility with legacy browsers, remove Symbol references
• 2601c3e v8.1.1
• 165c9bc Typescript: allow any key in BigNumber.Instance
• e453266 #222 Restore missing var to export.
• c316b1f v8.1.0
• 18bf82a fix formatting
• 788335b Remove [key: string] from BigNumber.Object, improve BigNumber.Object by addin...
• 8c34396 Allow { s: null, e: null, c: null } (NaN)
• cefa7c8 Rename interface BigNumber.BigNumberData to BigNumber.Object
• Additional commits viewable in compare view

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