chore(dependencies): Update pygments to 2.3.0

[pyup-bot]

This PR updates pygments from 2.2.0 to 2.3.0.

Changelog

2.3.0

-------------
(released Nov 25, 2018)

- Added lexers:

* Fennel (PR783)
* HLSL (PR675)

- Updated lexers:

* Dockerfile (PR714)

- Minimum Python versions changed to 2.7 and 3.5
- Added support for Python 3.7 generator changes (PR772)
- Fix incorrect token type in SCSS for single-quote strings (1322)
- Use `terminal256` formatter if `TERM` contains `256` (PR666)
- Fix incorrect handling of GitHub style fences in Markdown (PR741, 1389)
- Fix `%a` not being highlighted in Python3 strings (PR727)

Links

• PyPI: https://pypi.org/project/pygments
• Changelog: https://pyup.io/changelogs/pygments/
• Homepage: http://pygments.org/