Bump mathjs from 4.2.2 to 5.10.3

[dependabot-preview]

Bumps mathjs from 4.2.2 to 5.10.3.

Changelog

Sourced from mathjs's changelog.

2019-05-18, version 5.10.3

• Fixed dependency del being a dependency instead of devDependency.

2019-05-18, version 5.10.2

• Fix #1515, #1516, #1517: broken package due to a naming conflict in
  the build folder of a util file typeOf.js and typeof.js.
  Solved by properly cleaning all build folders before building.

2019-05-17, version 5.10.1

• Fix #1512: format using notation engineering can give wrong results
  when the value has less significant digits than the number of digits in
  the output.

2019-05-08, version 5.10.0

• Fix lib/header.js not having filled in date and version. Thanks @​kevjin.
• Upgraded dependency decimal.js@10.2.0, fixing an issue on node.js 12.

2019-04-08, version 5.9.0

• Implemented functions row and column (see #1413). Thanks @​SzechuanSage.
• Fixed #1459: engineering notation of function format not available
  for BigNumber.
• Fixed #1465: node.toHTML() not correct for unary operators like
  factorial.

2019-03-20, version 5.8.0

• Implemented new function apply. Thanks @​bnlcas.
• Implemented passing an optional dimension argument to std and var.
  Thanks @​bnlcas.

2019-03-10, version 5.7.0

• Implemented support for pow() in derivative. Thanks @​sam-19.
• Gracefully handle round-off errors in fix, ceil, floor, and range
  (Fixes #1429, see also #1434, #1432). Thanks @​ericman314.

2019-03-02, version 5.6.0

... (truncated)

Commits

• f8f4323 Publish v5.10.3
• 80fa60f Publish v5.10.2, fix #1515, #1516, #1517
• 66daf41 Update version number
• 7c62822 Publish v5.10.1
• 170c919 Update dev dependencies
• ce77993 Added some additional tests for engineering format
• 0a6aded Fix #1512: bug in format notation engineering
• d1451e2 Add node 6 testing again
• df4b334 Updated decimal.js. Remove node 6 and add node 12 to travis. Publish v5.10.0
• 065a065 Update nyc to the latest version 🚀 (#1496)
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #153.