Update pygments to 2.5.1

[pyup-bot]

This PR updates Pygments from 2.3.1 to 2.5.1.

Changelog

2.5.1

-------------
(released November 26, 2019)

- This release fixes a packaging issue. No functional changes.

2.5.0

-------------
(released November 26, 2019)

- Added lexers:

* Email (PR1246)
* Erlang, Elxir shells (PR823, 1521)
* Notmuch (PR1264)
* `Scdoc <https://git.sr.ht/~sircmpwn/scdoc>`_ (PR1268)
* `Solidity <https://solidity.readthedocs.io/>`_ (1214)
* `Zeek <https://www.zeek.org>`_ (new name for Bro) (PR1269)
* `Zig <https://ziglang.org/>`_ (PR820)

- Updated lexers:

* Apache2 Configuration (PR1251)
* Bash sessions (1253)
* CSound (PR1250)
* Dart
* Dockerfile
* Emacs Lisp
* Handlebars (PR773)
* Java (1101, 987)
* Logtalk (PR1261)
* Matlab (PR1271)
* Praat (PR1277)
* Python3 (PR1255)
* Ruby
* YAML (1528)
* Velocity

- Added styles:

* Inkpot (PR1276)

- The ``PythonLexer`` class is now an alias for the former ``Python3Lexer``.
The old ``PythonLexer`` is available as ``Python2Lexer``.  Same change has
been done for the ``PythonTracebackLexer``.  The ``python3`` option for
the ``PythonConsoleLexer`` is now true by default.

- Bump ``NasmLexer`` priority over ``TasmLexer`` for ``.asm`` files
(fixes 1326)
- Default font in the ``ImageFormatter`` has been updated (928, PR1245)
- Test suite switched to py.test, removed nose dependency (1490)
- Reduce ``TeraTerm`` lexer score -- it used to match nearly all languages
(1256)
- Treat ``Skylark``/``Starlark`` files as Python files (PR1259)
- Image formatter: actually respect ``line_number_separator`` option

- Add LICENSE file to wheel builds
- Agda: fix lambda highlighting
- Dart: support ` annotations
- Dockerfile: accept ``FROM ... AS`` syntax
- Emacs Lisp: add more string functions
- GAS: accept registers in directive arguments
- Java: make structural punctuation (braces, parens, colon, comma) ``Punctuation``, not ``Operator`` (987)
- Java: support ``var`` contextual keyword (1101)
- Matlab: Fix recognition of ``function`` keyword (PR1271)
- Python: recognize ``.jy`` filenames (976)
- Python: recognize ``f`` string prefix (1156)
- Ruby: support squiggly heredocs
- Shell sessions: recognize Virtualenv prompt (PR1266)
- Velocity: support silent reference syntax

2.4.2

-------------
(released May 28, 2019)

- Fix encoding error when guessing lexer with given ``encoding`` option
(1438)

2.4.1

-------------
(released May 24, 2019)

- Updated lexers:

* Coq (1430)
* MSDOS Session (PR734)
* NASM (1517)
* Objective-C (PR813, 1508)
* Prolog (1511)
* TypeScript (1515)

- Support CSS variables in stylesheets (PR814, 1356)
- Fix F lexer name (PR709)
- Fix ``TerminalFormatter`` using bold for bright text (1480)

2.4.0

-------------
(released May 8, 2019)

- Added lexers:

* Augeas (PR807)
* BBC Basic (PR806)
* Boa (PR756)
* Charm++ CI (PR788)
* DASM16 (PR807)
* FloScript (PR750)
* FreeFem++ (PR785)
* Hspec (PR790)
* Pony (PR627)
* SGF (PR780)
* Slash (PR807)
* Slurm (PR760)
* Tera Term Language (PR749)
* TOML (PR807)
* Unicon (PR731)
* VBScript (PR673)

- Updated lexers:

* Apache2 (PR766)
* Cypher (PR746)
* LLVM (PR792)
* Makefiles (PR766)
* PHP (1482)
* Rust
* SQL (PR672)
* Stan (PR774)
* Stata (PR800)
* Terraform (PR787)
* YAML

- Add solarized style (PR708)
- Add support for Markdown reference-style links (PR753)
- Add license information to generated HTML/CSS files (1496)
- Change ANSI color names (PR777)
- Fix catastrophic backtracking in the bash lexer (1494)
- Fix documentation failing to build using Sphinx 2.0 (1501)
- Fix incorrect links in the Lisp and R lexer documentation (PR775)
- Fix rare unicode errors on Python 2.7 (PR798, 1492)
- Fix lexers popping from an empty stack (1506)
- TypoScript uses ``.typoscript`` now (1498)
- Updated Trove classifiers and ``pip`` requirements (PR799)

Links

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

[pyup-bot]

Closing this in favor of #757