Bump bignumber.js from 7.2.1 to 9.0.0

[dependabot-preview]

Bumps bignumber.js from 7.2.1 to 9.0.0.

Release notes

Sourced from bignumber.js's releases.

v9.0.0

I received reports by email that the use of Symbol was breaking the library in IE8, so it has been removed. (The Symbol code was used to make the Node.js REPL default to displaying the string value of a BigNumber.)

This is a minor amendment that did not require any changes to the existing documentation, but strictly-speaking it is a breaking change so annoyingly I have had to increment the major version number.

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.

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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Superseded by #45.