Merge pull request itamarst#447 from itamarst/446-dask-process

itamarst#446: dask.persist() support.

Merge pull request itamarst#440 from itamarst/407-faster-messages

itamarst#407: Make Eliot abstractions more focused on actions, by deprecating Message

Merge pull request itamarst#424 from itamarst/423-dask2

Add support for Dask 2.0+.

Merge pull request itamarst#419 from itamarst/418.support-old-python-3.5

Make error message on Python 3.5.2 more useful

Merge pull request itamarst#399 from itamarst/highlight-scientific-co…

…mputing

Highlight Trio and scientific computing.

Merge pull request itamarst#390 from itamarst/386.pyinstaller

Support for PyInstaller

Merge pull request itamarst#348 from itamarst/public-parse-328

Public parser module

Merge pull request itamarst#323 from ScatterHQ/stdlib-tracebacks

Stdlib bridge logs tracebacks

Merge pull request itamarst#320 from ScatterHQ/sphinx-rtd

Use RTD theme by default for better previewing.

Merge pull request itamarst#295 from ScatterHQ/debug-json-encoding-er…

…rors-278

Nicer errors on JSON encoding failure.