Bump mathjs from 5.10.3 to 6.1.0

[dependabot-preview]

Bumps mathjs from 5.10.3 to 6.1.0.

Changelog

Sourced from mathjs's changelog.

2019-08-17, version 6.1.0

• Implemented function combinationsWithRep (see #1329). Thanks @​waseemyusuf.

2019-08-05, version 6.0.4

• Fixed #1554, #1565: ES Modules where not transpiled to ES5, giving issues on
  old browsers. Thanks @​mockdeep for helping to find a solution.

2019-07-07, version 6.0.3

• Add unpkg and jsdelivr fields in package.json pointing to UMD build.
  Thanks @​tmcw.
• Fix #1550: nested user defined function not receiving variables of an
  outer user defined function.

2019-06-11, version 6.0.2

• Fix not being able to set configuration after disabling function import
  (regression since v6.0.0).

2019-06-09, version 6.0.1

• Fix function reference not published in npm library.
• Fix function evaluate and parse missing in generated docs.

2019-06-08, version 6.0.0

!!! BE CAREFUL: BREAKING CHANGES !!!

Most notable changes

1. Full support for ES modules. Support for tree-shaking out of the box.

   Load all functions:

   import * as math from 'mathjs'

   Use a few functions:

   import { add, multiply } from 'mathjs'

... (truncated)

Commits

• 630411e Merge remote-tracking branch 'origin/develop' into develop
• c17464d Publish v6.1.0
• 2c3c852 Only one job for browser tests on travis (#1594)
• 5362108 Updated history and contributors list
• 4cee372 Added a combinationsWithRep function to calculate combinations with repitit...
• 7780eac Update webpack to the latest version 🚀 (#1591)
• fd70739 Update karma-firefox-launcher to the latest version 🚀 (#1590)
• e628320 Fix cleaning up *.generated.js files before build
• db870f0 Argh! Add // eslint-disable-line again
• 158673b Remove // eslint-disable-line again
• Additional commits viewable in compare view

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